Originally Posted by Eric_the_Red
My favorite Jim/Dwight prank was the classic "put all of Dwight's things into the vending machine". Another great one was when Jim was working in NY and faxing Dwight messages from "Future Dwight".
My personal favorite was when Jim began inserting quarters into Dwight's phone handset on an incremental basis. He did this so that Dwight would not notice and begin to compensate for the additional weight of his phone.
After he did this for a while, he suddenly removed all of the quarters from the handset--causing Dwight to crack himself in the head when he answered a call.