Many of the warning stickers on equipment makes me scratch my head.
Best warning I've seen is on a roll over protection structure on the Town of Harmony's small pavement flattening roller. They were doing some patching on my road and the operator rolled up in my driveway looking to fill his water reservoir. I hooked him up with the outside hose and saw "BANG HEAD HERE" written on the ROPS on both sides of a big red arrow facing downward.
Took a few minutes to fill his tank, we yapped and had a coffee. Dang if he didn't bang his head climbing back up on the Roller machine. He had painted it on there too!
He flattened out the center of my gravel drive real nice and gave me a laugh too.