a floater - Weird shapes that pop in your vision like a ghost wearing a

Weird shapes that pop in your vision like a ghost wearing a clown costume and dancing around your brain

I saw a floater in my vision, and it looked like a dancing ghost with a mustache.

My floater looked like a flying chicken, and I couldn't stop laughing.

I saw a floater in the middle of my math test, and I failed because of it.