And I think every government office and vehicle should have this one:
Personally I'd love working someplace that needed this sign:
I'd be afraid of the motivation hazard sign:
It's easy to lose motivation when you're blissed out. Thinking of some very talented musicians I knew once, I might've used a marijuana plant instead of a poppy on the sign.
Of course, there's other ways to lose motivation. My current workplace needs this one: