I Think It's A Sin - A way of saying someone is being ridiculous for doing someth

A way of saying someone is being ridiculous for doing something that’s not actually a sin, but now they're acting like they were exiled from heaven.

'I think it's a sin you took a nap during church.'

'I think it's a sin you wore pajamas to work.'

'I think it's a sin you drank coffee before 9 AM.'