During the Comedy Central Roast of Justin Bieber about a month ago, Saturday Night Live's Pete Davidson let the world know that his father was a New York City firefighter who died on 9/11. He then proceeded to make the entire audience cry laughing/feel uncomfortable with a couple quickfire 9/11 jokes. 

It was pretty masterful—turning a personal tragedy into an unexpectedly hilarious moment—and was easily one of the highlights from that show. But today, as one Twitter user learned, there's a difference between laughing at Davidson's 9/11 jokes and actually trying to make them yourself. And Davidson put that Twitter user in her place himself.

It all started when @TansuYesilay tried to fire off a joke in response to Davidson's tweet about International Firefighters Day. The subsequent tweets have since been deleted, but you can see them below:

There are very few moments in life where it's appropriate to drop a C-bomb on a stranger, but we're pretty sure this is one of them. People, leave the 9/11 jokes to Davidson.