seth, you mean just a glimpse at the guy, when he accidentally got into zone of my view?
or your mean "STARE", like "to gaze fixedly and intently, with the eyes wide open"?
definitely i would never do the second one while i am in my mind... unless it's Johnny Depp...

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"What lies behind us and what lies before us are small compared to what lies within us."
Oliver Wendell Holmes