If some random person went up to you and said 'I know your secret!' and then ran, what would you do or think?

If some random person went up to you and said I know your secret! and then ran, what would you do or think?
Freak the fuck out cause soemone knows my secret!
Freak the fuck out because its a random person!
Just laugh
Be very confused
I'd yell "i know your too" back
"Cool"
I'd do or say something else (say what)
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If some random person went up to you and said 'I know your secret!' and then ran, what would you do or think?
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