There are some great signs around here. Here are just a few around town.
Lift is strictly for human movement and not for luggage.
You only have one head. Protect it.
Save the zebra's (why is there an apostrophe?...zebras=crosswalks) and the people on them.
Please do not wash your hands.
Spitting around White House complex is strictly prohibited.
Do nut pluck flowers.
Do not pass urine here.