If you ever think your shower is clogged, and you keep pouring drain-o down the drain to relieve the clogging, and when that doesn't help, you call your apartment complex to come check out the problem, and call your friend to see if maybe you could borrow his shower for the night, before you do any of this, first check to make sure you haven't accidentally flipped the switch that closes the drain. It will save you a lot of embarrassment. Trust me. Because people will laugh at you. A lot. And they just might wonder how you ever made it this far in life, and you really don't want that to happen.