A man in a tie-dyed shirt and jeans is sitting on a bench with a dog and a guitar on his lap, as well as a harmonica near his mouth.
A man is riding on top of a camel.
The man cannot be sitting on a bench and riding on top of a camel simultaneously.
A man cannot be sitting on a bench and riding on top of a camel at the same time.
A person cannot be sitting on a bench if he is riding on top of a camel.