If people were obviously lying about their knowledge and abilities, I'd see how far they are willing to push it. "So how much experience do you have with python 4?"or" please write on this board how to do the well known programming problem fizz buzz, in sql"

Depending on your office building, "please demonstrate how you would handle the sliding window problem?" let them write for a few minutes. When they are done tell them "incorrect" and then walk over and open the window in your office.

Don't actually do any of these. They would make you a huge asshole but it would be funny.