It used to be in my industry (banking), but in the last few years nobody seems to drink at lunchtime any more.

15 years ago Friday afternoons used to be pretty much a write-off in terms of getting anything done. We had one project sponsor that would agree to something, then go down the pub, get lashed, and reverse his previous decisions. That was... fun.

I also knew one guy that used to get wasted at lunchtime, and then lay down in the data centre to sleep it off. Different times.