Odd as it seems, I have amassed a collection of signs taken in washrooms (as we say in Canada).
The first one was a ladies' room mission statement taken at Busch Gardens in Florida:

Their mission didn't include excellent punctuation.
This one is posted at my favourite Thai restaurant in Bellingham, WA.

It reminds me of the graffiti that was written on the wall of the bathroom of the August Moon Chinese restaurant in my hometown. In 8th grade, after attending our Saturday girls bowling league, a group of us, presumably an even number, would split the lunch special. I'm dating myself when I tell you that it cost $1.15 for one appetizer, an entree with rice, and a dessert. Two of us split the entree, one person having the appetizer and the other dessert. The writing on the wall of the bathroom was "flush twice, it's a long way to the kitchen.
Next up is one I saw in Quebec at Montmorency Falls:

After hand surgery, during my weekly visit to the occupational therapy department of St. Paul's hospital here in Vancouver, I found this gentle reminder in the unisex restroom. Excuse the blurriness; it was a laminated piece of photocopy paper that doesn't photograph well:

Blogless Marsha, living in a house with men, explained to me that in mens' rooms, you don't have to flush the urinals. They should have added remembering to put the seat down.
In the spirit of a picture is worth a thousand words, this ladies' room sign appeared on Royal Caribbean's ship, the Legend of the Seas:

Finally, Valentine's Day night required an emergency visit to Walmart to purchase denture adhesive to reseat a crown that popped off while biting into a pink raspberry gummy heart. I'll spare you the picture. Funny thing is that my son tried one first, and as soon as he bit into it said, no way, he didn't want to risk his recent dental work by pulling off a crown. I should have listened to him.

Their washroom aims for clean and adequate, stated on a sign far from the latter. I don't know about you, but I like a bathroom mission statement that exceeds the goal of adequacy.