I just tried this for the first time.
Dropped my Heineken keg can twice, once on my foot.
You gotta keep the suds seperate!
I witnessed a friend of mine drink beer in the shower once. I feel it was acceptable because it was under these circumstances:
1) It was an outdoor shower
2) At a beach house
3) He had just taken a dip in the ocean and was simply rinsing off the salt water thus no soap and no suds to ruin the beverage
4) It was a social situation where other folks where drinking as well
5) He still had his bathing suit on
In this scenario I feel drinking in the shower is permitted and should perhaps even be encouraged.
I would also mention that this friend is a huge alcoholic but that hardly seems pertinent.