I'll get my coat - A quick exit plan for someone who just got called out for be

A quick exit plan for someone who just got called out for being a total f***ing disaster and doesn’t want to stay and face the consequences.

'I'll get my coat' after his teacher told him he was the worst student ever.

'I'll get my coat' when he said he was going to beat up the principal.

'I'll get my coat' after he tried to eat a whole pizza by himself during lunch.