The first one is fine. In the second one you're mixing up tenses a bit. "He is" is in the present and "he thought" is in the past. You want this: - He acts like he thinks he was funny: he is acting (present) like he thinks (present) he was (past) funny. In this case he still thinks what he did was funny which makes more sense because thinks and acts agree. If you want it all in the past you could have: - He acted like he thought he was funny: He acted (past) like he thought (past) he was (past) funny.

Hi Javier! For me personally I'd say, "He acts like he is funny." Or maybe only, "Woa, he really thinks he is funny." Or, "Does he really think he is funny?" I hope this helps!

Maybe I should have clarified it a little more. The context would be something like this: someone is making jokes thinking that he is funny but he's not, actually he is being rude. In that case, which would be correct to say? And in case that both are, which would be more likely to be heard?