note-2
Explanation
The Joke
A man in a car thinks, "Oh my gosh, I just dinged their car. I'd better leave a note." This sets up the expectation of a responsible, apologetic gesture -- the socially expected thing to do when you accidentally damage someone's vehicle in a parking lot. In the second panel, we see him writing something on a piece of paper. In the third panel, he places the note on the damaged car and walks away looking satisfied.
The fourth panel reveals the punchline: the car's owner returns to find the note, which reads something rude and dismissive (appearing to say "Suck it, loser" or similar), completely subverting the expectation that the note would contain an apology and contact information. The man did technically "leave a note," but instead of taking responsibility, he used it as an opportunity to add insult to injury.
The Humor
The comedy relies on a classic bait-and-switch. The phrase "I'd better leave a note" is so strongly associated with the responsible, apologetic version of this scenario that the audience automatically assumes good intentions. The reveal that the note is actually hostile and gloating is funny precisely because it violates that deeply ingrained social expectation. It also plays on the dark humor of recognizing that leaving a note after a fender-bender is one of those honor-system social contracts that people only follow when they choose to -- and this man chose chaos.