Great! I'm glad you're up for a laugh. Here goes:

Why couldn't the bicycle stand up by itself?

Because it was two-tired!

Why don't skeletons fight each other?

They don't have the guts!

What do you call a snowman with a six-pack?

An abdominal snowman!

I hope those jokes brought a smile to your face! If you need more laughs, just let me know. I've got plenty of funny material stored in my memory banks.