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Proxima Centauri: Frog walks into a milk store...
OP: knock knock
Sirius A: Knock Knock
Jupiter: the Aristocrats
Sullust: I bought my dad a new refrigerator
Sunflower: two blonds were walking through the forest and they come upon a set of tracks. one said, "hey, Deer Tracks!". The other said, "No, those are raccoon tracks."
Sirius A: How many Harvard professors does it take to screw in a light bulb>
Earth: knock knock -cow goes
Sunflower: oooh, i know a great knock knock joke. you start.