In a block of flats:
"LIFTS TEMPORARILY SUSPENDED"
Barbeque Firelighting Fluid:
"Caution Flammable Liquid"
Various cockpits:
"Fuel: Pull Off"
(and now what do I do with the Knob?)
More perversely, the common practice with low wing planes of painting the walkway black, all the way across the wing root and flaps, then applying a decal "no step" on the flap.
Why did they paint it non slip black then?