Please put you cigarette butts in the trash can. (Original sign)
The cockroaches are getting cancer (added part)
Please put you cigarette butts in the trash can. (Original sign)
The cockroaches are getting cancer (added part)
On dirty vans:
"Please overtake quietly. Asylum seekers are sleeping inside."
"Also available in red" (assuming the van was red).
I like these, because they're more creative than the usual "clean me" ones.
I went ghost hunting with my friends once, and someone spray painted in white "POOP" over a stop sign. It was awesome, and I took a picture of it, but it's still on my phone or I would post a picture of it on here. Maybe later, I'm so lazy.