This sign is posted by the door of a shop near my house:
This is why I'm planning to homeschool my children.
The best part is that by the side door, in the same handwriting and on the same blue paper, is another sign on which the apostrophe is correctly omitted. It's as if the owner of the shop wasn't sure which usage was correct, decided to hedge her bets, and just used both. Hopefully, all of the grammarians who frequent this beauty salon/consignment shop (?!) will use the side entrance.
To add insult to injury, I made an appointment for my husband to have a physical, which is required for his new job (hooray!). The receptionist informed me that the physical would be performed by a female doctor, but that I shouldn't worry because there would be "nothing evasive involved". What a relief! I'd hate to think that a medical professional would beat around the bush while performing an examination...