A man in a bright yellow shirt juggles while riding a unicycle.
Clown entertains people at a birthday party.
The man the must not be a clown and must not entertain at a birthday party.
Not every ll man in a bright yellow shirt is a clown. Just because someone is juggling doesn't mean he entertains others. Juggling and riding a unicycle happen at circuses and other places, not exclusively at a birthday party.
It states that it is a man in a yellow shirt not a clown.