What are some good jokes for a comedy comic?

I'm making a comic about a bittorent tracker user having cops on his tail xD. Its supposed to be funny and the part 1 was (I posted it in my tracker forum and everyone liked it) But I have no ideas for part two. Any good jokes or funny situations/events?

Cop: Knock! Knock!???: Who's there?Cop: Go phoque yourself!

Person one: Alright bring it!Person two: Oh I already brought it, put it together and inserted the AA batteries bitch.Person one: ... f***