I'm too lazy to go take a picture - my current favorite. On the front of my get that crap out of my driveway right now 60" scary huge tractor mounted snow blower... a pictograph of a person sticking their foot in the auger. Duh...
Not really a warning label, but I thought this was odd. This sticker was clearly posed on a pump that was on and active and that I definitely filled up my truck with. No idea what a pump could fail for (other than weights and measures shutting it down for inaccuracy) but I've never seen one before ...
I dont have a pic but years ago I bought a flexible extension from snapon, its bascially a spring (of sorts) with 3/8" socket adapters on both ends. attached to it was a sticker that said "NOT TO BE USED AS PRYBAR"
More likely the hose is older than spec or something along those lines otherwise the accuracy part would be punched and the pump locked up.
I had some fish tank lights (metal halide) that had a very chinglish warning label of "Do not touch when burning"
This is from the Paris Metro: Roughly translates to: "Do not put your hands on the door: you risk getting a strong pinch."
I like those here and here example: a folding baby stroller with label that says: "Remove child before folding "