Top 10 Jim Pranks on Dwight

• 10 - The Bitch-Slap, "Traveling Salesmen" : Not an actual prank, but the look on Dwight's face after Jim unexpectedly slaps him (in the middle of his tirade about being more vulnerable from behind) is priceless. And Jim's impish glee as he walks away is equally satisfying.
• 9 - Stabbing the "Fitness Orb", Performance Review : Jim's weariness as Dwight disturbingly gyrates on the orb, the careful consideration as he decides $25 is a worthy expenditure, and the quick, aggressive stab of the scissors. Again, not really a prank, but watching Dwight disappear behind his desk as he speedily falls to the ground is always a big laugh.

• 8 - The Gaydar Machine, "Gay Witch Hunt" : Even from Stamford, Jim manages to pull a doozy on Dwight, first lying about a Gaydar Machine over the phone, as he looks up the nonexistent item up on the Sharper Image homepage. Then he mails Dwight what is obviously a metal detector with "Homo" and "Hetero" decals placed on the ends. Ingenious.
• 7 - Dwight's stuff in the vending machine, "The Booze Cruise" : When he finds all of his desk supplies inside the break room vending machine, Dwight goes from frustration to anger to pathetic acceptance, ultimately using a bag of nickels, provided by Jim, to BUY BACK his own stuff, Jim looking on, calmly eating his chips. The real kicker is his indignation when Pam buys his pencil cup.
• 6 - Stapler in Jello, "The Pilot" : An oldie, but a goodie. Dwight's over the top reaction proves this has happened MANY times before, Michael and the Temp play along, and Jim can barely keep from laughing as he smashes his cheek into his hand in a strained effort. When he asks, "What makes you think it was me?" he is awesomely EATING red jello.
• 5 - Dwight Spying on other "teams," "The Alliance" : This is really an episode-long prank, as it includes the very first, "Absolutely, I do," Dwight's Survivor-like understanding of office politics, Jim enthusiastically taping Dwight into a box (Dwight tipping the box over is my favorite part), and concluding with a superior, and yet still-duped, Dwight having dyed his hair platinum blonde.
• 4 - Locking Dwight in his "Work Space," "Health Care" : After a very amusing argument about the fake diseases Jim has written down (Count Choculitis and Hot Dog Fingers!), Jim lazily picks up Dwight's own keys, walks out and locks Dwight inside, then casually tosses the keys across the room where not even Stanley cares. Jim is theatrically chirpy when Dwight calls him on the phone, demanding to be let out, an order he breezily ignores. Bonus points for throwing an Eskimo Pie at the window and hitting the glass directly over Dwight's peevish face.
• 3 - Faxes from Future Dwight, "Branch Closing" : Dwight desperately tries to save Stanley from the "poisoned" coffee after receiving a fax from his future-self. It is of course Jim, again, easily tripping Dwight up all the way from Stamford, his knowledge of what Dwight will fall for is so vast. The delivery of Jim's, "I'm sending him faxes....from himself....from the future," is what really sells it to me.2 - Jim's Dwight Impression, "Women's Appreciation Day" : Watching Dwight's confusion transform to outrage when Jim comes to work dressed, walking, and talking EXACTLY like Dwight, is just about the funniest thing I have ever seen. Dwight's helpless claims of identity fraud are shuffled aside for Jim's perfect delivery of, "Bears, Beets, Battlestar Galactica." And the fact that it ends with Dwight's pathetic, but equally hilarious, impression of Jim's camera mugging makes it all the more impressive.
• 1 - Jim's Permanent File, "Conflict Resolution" : Not technically a prank, but the description of these prior offenses is so wonderful, we don't even need to see them to be in hysterics. The list of pranks, read aloud to Dwight's disapproval and Jim's false innocence, culminates in "Today I hit myself in the head with my phone," the most excellent and least obvious prank I have ever imagined, bringing a joyfully proud smile to Jim's face. He has a TH saying, "You know, these really don't sound that funny, one after the other." As the excellent TWoP recapper said, "He has never been more wrong."