Meditating in my shower

I have been baffled by the occurrence for years. I have seen it many times. I have no explanation...until now.

It's the spider in the shower phenomena. Every now and then I look in my shower and there is an eight legged guest and the question is how did he get there. Since they cannot climb the walls of the tub I use to think they came up the drain, until I saw a few on a ledge around the tub. How could they have crawled the side of tub? They cannot stick to that surface so they would be unable to climb it from the bottom of the tub so the drain gets ruled out. I have never seen one come out of the faucet so I am guessing they do not come in that way. They are not falling from the ceiling and there are no holes around the shower stall so that is not an option.

The last alternative is a round plate at the end of the tub under the lib of the tub which is a few inches under the faucet. The plate is not sealed to the tub. It has an opening along the bottom edge. If they did not cling to the plate when crawling through they would fall to the bottom of the tub. A few may cling to the plate and climb over it to the edge of the tub. Once up there they must realize they cannot climb anywhere and it explains why some are sitting there.

The more I think about this theory I realize I have to much time on my hands and not enough things to ponder while I shower.