Harry: Piss on me? (proceeds to spray Wild Bill with it on full blast)
The part with the Moon Pie. You have to admit, that was a pretty funny prank. (Brutal, who was the recipient of the Moon Pie spit, admitted it.)
Speaking of the urinary tract infection, the part where Paul is laying on the floor in pain creates a laughing fest when Paul responds to Coffey saying, "Boss? I needs to see you down here.":
Paul: This is not a good time, John Coffey. Not a good time at all.
Old Toot-Toot taking the role of Arlen "Chief" Bitterbuck during the execution rehearsal.
Brutal: Arlen Bitterbuck, you have been condemned to die by a jury of your peers, sentence imposed by a judge of good standing in this state. Do you have anything to say before your sentence is carried out?
Old Toot-Toot: Yeah. I want a fried chicken dinner with gravy on the 'taters, and I wanna shit in your hat, and I've got to have Mae West sit on my face because I'm one horny motherfucker.
All of the guards immediately burst into hysterics. Even Percy, the self-proclaimed professional, is laughing!
Not to mention just beforehand when he is pretending to pray for forgiveness.
Old Toot-Toot: The lord is my shepherd and so on and so forth. I'm sorry for all the bad shit I've done, and the people I've tramped on, and I hope they forgive me, and I'll never do it again - that's for sure. Still prayin', still prayin', gettin' right with Jesus!
Harry: Do it quietly, you old gink!
Earlier, back by the cell:
Paul: Is the prisoner's head properly shaved?
Dean: Nope. It's all dandruffy and it smells.
Paul: I will take that as a yes. Let's go, Arlen.
And then when they rehearse 'rolling on two' with Toot in the chair: