(I have a habit of taking something someone has said and replacing some of the words with “your mum”, just as a joke. Sometimes I don’t think through what it is I’m about to say and get myself into hot water. At this point in time my class is making posters in groups as it helps us absorb knowledge better.)
Student in another group: [Tutor] there isn’t enough room on this paper.
Me: there isn’t enough room on your mum!
*I freeze in horror as I realise what I’ve said*
Student next to me: [my name] oh my god that’s so rude! *starts laughing at my face*
Me: *spluttering* no- I didn’t mean- oh c**p *puts my head on the desk in shame*
(Thankfully the first student didn’t hear me, but I’ve since learned to think before I speak!)