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."
by Rockonboy123 April 30, 2023
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