You were 17, in high school doing good. it was lunch and you walked to Tim Hortins as you were about to walk you saw these group of guys.. they didn't look too older then you maybe even the same age, you decide to open the door for them. so you just stood there holding the door for them as you say

ladies first.

you were clearly a girl, and you just said ladies first.. to a group of guys, you just smiled and waited for there reaction.