Fun/funny
One thing I do wrong aaaaaaall the time here is de difference between fun and funny. I didn't there was any so I just used them whenever. But there is a big difference between them. Fun is more like nice, neat and funny is like you're laughing because it's funny.
If you say it was funny at your friends house (which I did before) they think we were all laughing the whole time... The difference is really annoying to me!