When you are all alone and bored so you just look in the mirror and be like welcome to chili's. On rare occasions it is used by the chili's staff to welcome.
When you fail at something in life (eg. failing an exam or not getting a job), go home and spend an hour just standing in the shower, propping yourself up against the wall with your eyes on your feet.
Caleb knew the only thing to do after he didnt get prefect was take a failure shower.