Depends on the person...if it was a creepy person, または even a normal person I knew, I'd be very creeped out, if it was a creepy person または even normal person I didn't know...I'd still be super creeped out...either way I'd call the cops, & probably ask them the reason they've been stalking me since I was 10...
There could be a good side to this, if it was the sexiest guy you've ever laid eyes on, that would be like, awesome...I'd thank God, jump in his arms, & live happily ever after...
I'd probably tell them "I hope I sufficently bored you," and if they say, no you're fascinating I'd add, "In those five years, あなた did learn that the sheriff is my neighbor right, and if I call him he will be here in minutes." yeah, the sheriff actually is my neighbor so I'm 安全, 安全です in that respect.
Depends on who it was, if it was a friend id just laugh, if it was some ランダム person on someone i dislike id grab either a glock または ak47 whichever's closer (: