Andrew gets up when I do in the morning, right around 6:30 a.m. In his early days, I'd set the bouncy seat down on the bathroom floor so he could chill while I was in the shower. He then went through a phase where he'd sleep until 7:30 or so, so I would just go get him when I was done getting ready for work, and then I'd change/feed him.
Now, he usually gets up at 6:30 so I bring him in the bathroom (the husband has a new habit of metal detecting every morning and he leaves around 5:45/6:00 a.m....don't even ask).
Anyway, Andrew has decided that when Mommy steps into the shower, she is actually stepping into another dimension. He bawls his little heart out as soon as I slide that shower curtain. I have to leave one end open and talk/wave to him so he calms down. The other option is to take a bath while he leans over the edge, splashing his hands in the water. No amount of toys help/distract in this situation. I can only hope he learns that Mommy is fine and she will be out of the shower in 5-6 minutes.