Where do they come from?!?! Have a full bath in my finished basement and am often greeted by a nice giant spider waiting in the shower. This is a one piece sealed fiberglass unit, and the basement is drywalled w/ drop ceiling. Are they 'finding' the shower from my unfinished storage room 40 feet away?? Can they come up through the drain? Im assuming they like the moisture of the shower. Anyway this is 'bugging' me since I never see them on the carpet on the way in there...creepy!