Season 1-1x03, Their are two hilarious scenes in this episode, firstly, the imfamous Susan getting locked outside her house naked and secondly, at the dinner party when Bree says "Rex Cries after he ejacluates!", that one still makes me laugh whenI think about it.
Season 2-2x13, The nun fight, so outrageous and wrong, but how can you think thats not funny?
Season 3-3x06, where the ladies are outside lynette getting drunk! They whole scene was funny, from Lynette spilling the drink when she leans over to comfort Susan, to Susan saying "Oh my god, Im going to die!", and then the cab arrives, man that is funny.
Season 4-4x03, When Lynette is high and is playing charades, "Hang em high had three syllables"
Season 5-5x11, The Whole lee and Susan storylines, whenlee touched Susan's boobs and the face she pulls, the morning after, and then Gabby's laugh when bob comes over.
Season 6-6x15, Bree doing the lap dance.It was so awkward and hilarious, bree really didnt know what she was doing.
Season 7-7x04, When the little person goes to terrorise Renee and Keith's date. Renee reactions was hilarious, I wonder what the incident at the circus was?
Season 8-8x01, The Car scene. Every part, from Gabby chewing the tobacco, Gay aunt Shirley, and the hijacker.
They're hilarious, I'm pretty sure each of them made me laugh out loud the first time I watched them. 
I'll try to think of some others later. Right now another one that comes to mind is when in 1x12 Edie throws Mrs. Huber's ashes in Susan's face, because rentlover1 mentioned it to me via Facebook. 
