Cool, I'll start.

I love me some paradoxes because they're so mind-boggling and puzzling. Let's go with the Liar Paradox, which goes something like this:

Suppose there is a person that only lies. If that person declares, "I am lying", is he lying or is he telling the truth? If that person is lying, that means they are saying "I am telling the truth". But if the statement "I am lying" is true, then they must be lying. So are they lying or telling the truth?

I recommend reading from the link because I am not very good at explaining this paradox, but it is a fun one to think about

What do you think?