Here are some great signs from this site below. And there are more at the site.
A sign seen on a restroom dryer at O'Hare Field in Chicago: Do not activate with wet hands.
At a car dealership: The best way to get back on your feet? Miss a car payment.
At A Laundry Shop: How about we refund your money, send you a new one at no charge, close the store and have the manager shot. Would that be satisfactory?
At a Music Store: Out to lunch. Bach at 12:30. Offenbach sooner.
At a number of US military bases: Restricted to unauthorized personnel.
At a pizza shop: 7 days without pizza makes one weak.
At a Santa Fe gas station: We will sell gasoline to anyone in a glass container.
At a tire shop in Milwaukee: Invite us to your next blowout.
At a Towing Company: We don't charge an arm and a leg. We want tows.
In a safari park: Elephants please stay in your car
In a Tacoma, Washington men's clothing store: 15 men's wool suits - $100 - They won't last an hour!
In a Texas funeral parlor: Ask about our layaway plan.
In a toilet: Toilet out of order. Please use floor below.
In a veterinarian’s waiting room: Be back in 5 minutes. Sit! Stay!
In an office building washroom: Toilet out of order. Please use floor below.
In an office: After the tea break, staff should empty the teapot and stand upside down on the draining board.
In an office: Would the person who took the step ladder yesterday kindly bring it back or further steps will be taken.
In downtown Boston: Callahan Tunnel - NO END
In front of a New Hampshire car wash: If you can't read this, it's time to wash your car
Outside a farm: Horse manure, pre-packed bags, $10. Or, do-it-yourself, $1.
Outside a Hotel: Help! We need inn-experienced people.
Outside a muffler shop: No appointment necessary. We heard you coming.
Outside a photographer’s studio: Out to lunch; if not back by five, out for dinner.