Here are some of the best politically-motivated pranks I've contemplated over the years, but have never had the motivation to commit any time or resources to pursuing.
10. Fundie safari
Dress up as the Crocodile Hunter and bring a camera crew into a conservative church during Sunday services. Speak with a thick, exaggerated Australian accent: "And nayow we see the weeng-nut in its native hebitet. The fella in the whoit collah - let's call 'em Fish Face - is gettin' ready to do his displye dance. Hey theh, Fish Face! Be cehful not to displye any intelligence - they considuh thet a threat. I'm gonna git real close to 'em..."
9. Chickenhawks Punk'd
Lure chickenhawks into a Marine recruiting office unawares and record their reactions on camera when they're suddenly asked to enlist after vehemently endorsing invading Iran or other countries. First recording them ranting and raving about this or that or the other enemy must be destroyed, and how we're all gonna die if we don't invade ___. Then record their faces as they're asked to do the logical thing - enlist to go fight this sacred battle themselves. Upload the clips on to Youtube for a series entitled "Republican Chickenshit a-go-go."
8. "Welcome to Texastan."
Add "-stan" to signs marking cities, counties, and states controlled by conservatives, and remove the suffix when better people are elected. "Texastan." "Floridastan." "Arizonastan." I don't mean graffiti - I mean actually alter the sign with letters that look like they belong there so that the signs appear orderly and legitimate, which make it take longer for them to be replaced.
7. Community standards
Clandestinely repaint Hummers and gas-guzzling trucks and SUVs flamboyantly pink. A real, professional-looking paint job too, not a Krylon deal. Add flower designs and rainbows if you wish. If you know and despise the owner, include a dandified caricature of them with long eyelashes and rosy cheeks.
6. Seasoning the bisque
Attend a catered Tea Party event pretending to be with the caterer, and then announce that you regret to inform them that some of the food may have been contaminated with urine by a disgruntled ex-employee who lost his health insurance. Then, a few minutes later, announce that it turns out the ex-employee realized he would be covered by government programs, so he refrained from carrying out his plan. "Gosh, folks, aren't we glad for government health insurance?"
5. Bring the right together.
Stage a convention-style event for Republicans, but don't tell them you've also invited the KKK, Neo-Nazis, the Westboro Baptists, and apocalyptic militia cults. Also don't tell them the event is being recorded, the media is present, and that the event banner shows the GOP elegphant, the Nazi hawk with Swastika crest, and a robed Klansman with their arms locked in brotherhood. Then when the joint is nice and jumping, inform the Black Panthers, college fraternities, and college football teams nearby what's going on. Make sure the event was covered under RNC insurance. :D
4. Repo Man.
Steal Donald Rumsfeld's Presidential Medal of Freedom. The fact that such a mass-murdering traitor has thus far eluded justice is intolerable, but that he has our nation's highest civilian honor in his possession is really one straw too many. I don't know or care whether he deserved it in 1977, but he doesn't even deserve US citizenship today. Go snatch the medal back for the honor of the country.
3. Portrait of an Evil Shitburger
Irreparably deface the official presidential portrait of George W. Bush, and keep defacing every replacement that is put up until it has to be specially protected. The man was never President of this country, never even pretended to be a legitimate leader in the way he behaved and the policies he imposed, and wielded power as a criminal and a traitor without shame, a gleeful torturer, and a murderer without conscience. In lieu of a war crimes trial, we can at least protect the integrity of the presidential portrait gallery. I don't think that's too much to ask.
2. Cattleprod in bronze.
Build and dedicate prominent statutes to John Brown, FDR, JFK, Charles Darwin, and Barack Obama in as many fervently wingnut communities as possible. The fight to get them built would be a lot of fun - obviously it wouldn't be with public funds, but the main battle would be over zoning and permits - as would watching how the community attempts to deface and sabotage the memorials once constructed. Teaching them how futile their petty attacks are would be a lot of fun too: Ensure that graffiti never lasts long than a few hours, physical damage never lasts longer than a day, and total destruction leads to total replacement within a week.
1. The ultimate Fuck You.
Build a giant - and I do mean GIANT - highly prominent Iraq War memorial in Austin, Texas listing the names not only of Americans killed, but of civilian Iraqis, and include a giant plaque in letters a dozen feet tall expressing America's shame at the murderous and horrific actions of unelected dictator George W. Bush in 2003, and a pledge to seek justice against him and his co-conspirators no matter how long it takes. "May the stain upon this nation's honor and the honor of Texas be erased some day." Build the monument on private land owned by a member of the cause and within all zoning, regulatory, and other laws in line, so that none of the authorities can mess with it or water down its content. Don't even let anyone know what it is until the day of unveiling, and then spam images of it to every wingnut in the country so that they go batshit simultaneously. It would be glorious, and the cat-and-mouse game of protecting the statue against people trying to deface or destroy it would be a lot of fun.