Some signs just don't go well together.
Or make sense.
Here are some top contenders...
Enter here. Don't enter here. Whatever you do, don't make up your mind.
When you smoke, please don't.
Yes Jesus. No God?
It's very sanitary. Come down and sniff.
Save the dead!
You can park here, but really you can't.
Welcome to Oxymoron Clothing.
This may be a fake, but it's funny.
Blasphemy! (A contradiction in music)
Red? With Green.
I just don't understand.
At any voltage it's painful. Well, sort of.
Which way? Not sure.
(Hopefully this is at the end of street.)
Continue the contradiction and laugh at Toilet Iconography.