This suspicious man in a top hat, sunglasses and trench coat walks up to you and says 'we know what you did' then runs off. What do you do?

"we know what you did"
"we know what you did"
Freak out and run
Just be confused but go about my day
immediately think back to anything bad i may have done
Punch him cause he's creepy
Threaten to call the cops
Chase after him to try and ask for details
Other (what would you do?)
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This suspicious man in a top hat, sunglasses and trench coat walks up to you and says 'we know what you did' then runs off. What do you do?
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