Here's how it works: The comedian shows his viewers a screen shot of a captcha code with a dirty word, then says something along the lines of, "It's one of those CAPTCHA things. You know those squiggly words you have to type in before you buy tickets to concerts and stuff."
Then he reads the dirty word or phrase out loud, his audience laughs, and then Fallon reaches for this joke: "Honey, I'm about to get those Ed Sherran tickets you wanted. Don't come into daddy's office!"
In the video above, you'll notice the late-night host subbing in different artists to, uh, keep it fresh.
Only time will tell if Fallon continues to recycle this material that really wasn't even that funny the first time.