Especially an active speaker like a subwoofer with the amp inside.

My mom poured water into a receiver of mine when trying to water plants in a window behind the entertainment center. Sony actually repaired it under warranty (I have no idea why), but it wasn't good.

Pioneer PDP-5020FD, Marantz SR6011
Axiom M5HP, VP160HP, QS8
Sony PS4, surround backs
-Chris