A table full of people fucking around on their phones (and of course the establishment in question needs you to sign up for an account and fill out a profile before you can pay your bill) or the bullshit and mental hoops some people will jump throught to scam their friends out of a few dollars when deciding how to split a bill.
Regarding "scam their friends": 99% of the time it's not about "scamming": Cashiers ask people for which items they want to pay and mistakes happen because people sometimes remember things wrong. Once everyone paid there are still some few unaccounted items for the table due to those honest mistakes.
The person who ordered the caviar, lobster and cocktails ALWAYS suggests just splitting the bill evenly. The person who just got a starter and a glass of water then has to be the "cheap" one and push back (and they probably ordered like that because they didnt want to spend $200 on dinner).
Eventually we just stopped inviting the guy who orders a $500 bottle of wine for "the table" aka themselves then insists on splitting the bill evenly.