I know a few
A go-to phrase for Ray Naker when some random person brings up something that he already knows about. He says it to show how much of a fool he thinks the person is, and how much he hates the coons who messed him up.
Ray sees a guy talking about his bad breakup and says, 'I know a few.'
A new guy at the bar talks about his bad job, and Ray says, 'I know a few.'
When someone brags about their ex, Ray just says, 'I know a few.'