I have never witnessed nor taken part in post flight drinks on the crew bus heading back to the hotel after turnarounds flight BKK-SIN-BKK back when my former airline didn't limit its visits to BKK to a 24 hour layover. Nevertheless I must say that the orange juice we used to drink on the crew bus was somewhat fizzy and would make the crew laugh after a few glasses,...Must have been the effect of cabin pressure :-)