I'm joking, calm down!
a way to tell someone their reply is so bad it makes your joke look like a superhero.
'I'm joking, calm down!' after I said my pet goldfish died and he said, 'My goldfish died and then came back as a ghost.'
'I'm joking, calm down!' because I said I was tired and he said, 'I was tired for a week.'
'I'm joking, calm down!' when I said I got a D and he said, 'I got a D and then failed everything.'