When you're not sure wether to put hahaha or haha. You hope the person will take it either way. Many would think there is not a big difference between hahaha and haha but they are wrong. Haha is more of an unnecessary pause while hahaha signifies a joke was said that was actually worth a chuckle. Hahah is a good compromise for the indecisive.
Guy 1: Hey, so I totally hooked up with your mom last night.
Guy 2: Hahah, no way.
The crazy soccer moms in minivans who think they own the road because they have small children throwing balls at their face. Minivanners will likely cut in front of you with their huge, bulky car causing you to almost wreck because their child is late for a piano recital. Minivanners should be banned from driving on the road.
Driver: Fuck! That damn minivanner drove her huge ass wannabe van right into my car without even bothering to check if the lane was clear or not.
Passenger: Damn minivanners need to get off the road.