People who butt into my conversations at restaurant. I am not talking about others at the table, but someone walking past and hearing the waiter say "That's my favourite" and stopping to tell the waiter "Dude no one cares what you like, just bring their food"
I know the owner of the place, they were not the owner...just another customer. And I *asked* the waiter, who is a kid who I have known for over 15 years - he's my nephew's best friend, for an opinion.
Not your conversation, stay out of it