The full Warning Stickers range — die-cut, laminated and weatherproof. Pick your size and slap it on.
Hazard-sign format, redirected at something funnier — the yellow triangle, the black pictogram, the deadpan caption underneath. The joke works because the layout is exactly right, so these are drawn to real sign proportions rather than approximated.
They land well on toolboxes, workshop doors, laptops, gym bottles, car bumpers and anywhere a real warning sign would look at home. Laminated vinyl keeps the high-contrast yellow from fading, which is what would kill the gag first.