I can go better for shithousery…
We went out to a Mexican place in Black Heath many years ago as a large group. Table wasn't ready so we waited at the bar. There were 6 of there at this stage so I got the first round in. As others arrived, they started their own rounds so we stayed in ours. My Brother got the second round. My Brothers friend got the third round and quietly stuck it on the table bill
Apparently he's renowned for that sort of thing - still has his communion money as we say back home.
Maddest thing was no-one was prepared to call him out on it. Not really my place so I didn't.