In the season finale (I think it is anyways) when Mulder and Scully discover the alien/human kid that can read minds, he (the kid) is playing chess against a chess master at the beginning. The kid's opponent gets shot, and he knocks the chess board onto the floor, but then it's miraculously back on the table!
(I wouldn't normally make a point of posting this sort of thing, but it's REALLY obvious if you watch the episode)