Easily Confused: Fun Vs Funny

fun
We had a lot of fun going down the big slide!

fun
We had so much fun at the carnival going on rides.

funny
Hahaha! That story is so funny! We laugh every time we hear it.

funny
See that guy over there? Don't his shoes look funny?

funny
My head feels funny, I think I need to lie down.

funny
A. You should drink this. It's really, REALLY good.B. Why, what's in it? You're acting funny...