Schrodinger's Wave

When a person might be waving at either you or a person behind you. There is no way to know unless you turn around to check.

"Bro, I was stuck in a Schrodinger's Wave yesterday!"

"How so?"

"I saw this lady waving in my direction and I wasn't sure if she was referring to me or someone else. Turns out she was waving to someone behind me after I checked."

"Damn, that's rough bro. Must've felt awkward afterwards."