If someone’s overslept…
“Was it 2-for-1 all night in Wetherspoons then?”
“I don’t know where you put it all, must have hollow legs”
“Hope you didn’t sleep in them clothes”
“Got a bit of chilli sauce down your shirt there…”
“Got you some paracetamol…”
(Obviously you’re relying on your boss having some sort of sense of humour and nobody having an actual drink problem…)