Dont feed the driver!

Spotted this whilst working today! Made me chuckle during an otherwise dull day.

Question is - was this some kind of practical joke by one of his workmates? Or was it a random member of the public. Maybe someone is concerned for his health! Who knows?

Certainly beats the usual 'also available in white' or 'clean me' that you often see.

Anyone got alternative messages for dirty cars/trucks, or if you've seen anything unusual please post below.