首先大家要区分fun跟funny到底有啥区别：
fun: happy/exciting
funny：hahah, lol: laugh out loud
一件事情很好笑(好玩)的表达：
I burst out laughing.
It cracked me up.
I couldn't stop laughing.
It's funny.
It is hilarious.
LMAO: Laughing my ass off.
It made me laugh.
不好笑、不好玩的表达：
It is not funny.
It's corny.
The comedian failed to entertain us, with his corny jokes and awful singing.
It bombed. 砸了
The play bombed.