“Playful drivers” on expressways
People going say, 5 mph lower than what you want to do.
You go to pass them… they speed up to 4 more than you want to go.
“Okay, must not have realized they were going that slow”. So, you get back into the traveling lane.
They slow back down to the 5 mph lower than what you were doing.
“What are doing?! Do you hate people passing you that much?!”