...laughing and joking with one another really loudly?
I don't know why, but I find it really unprofessional and rude. Surely colleague bantering (at that noise level) should be left to the confines of the staff room?
Today I went to two shops where I witnessed customer assistants standing around joking with each other and laughing really loudly with customers walking by, or being served.
It makes me feel uncomfortable and I can't quite put my finger on why...