The worst turbulence I ever experienced was over the Bay of Bengal flying with MAS. It was so severe that the CC were strapped in and had their 'fixed grin' faces on, which actually worried me even more.
We had warning of the conditions as the seat belt signs came on 10 minutes before we started getting shaken about. But it got worse and the pilot decided he'd had enough.
He didn't do a 180, more a 120, which looked very odd on the skytracker thingy but I've always thought that for the pilot to do such a drastic change of course it meant that he was finding things very hairy. At no stage did he talk to us, fair enough in the turbulence, but not afterwards either.
The Bay of Bengal of course does not always have the smoothest flying conditions in the world!