What are some good jokes you can keep on standby should you ever find yourself in front of a crowd?

I was out DJing last night, and it was my buddy's birthday. I said a few lame lines and wished him a happy birthday, but it got me thinking that I should have two or three good jokes I can keep on standby that I can use in front of a moderate to large crowd to break the ice a bit.

What are some of your favorite crowd pleasers?

Edit: Sorry if this has come up already

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