That's hilarious! Don't feel too bad, I've done much the same thing when I see someone who looks like someone I know, or someone famous. Maybe not so much because I'm hoping it really is who they appear to be, as I'm enjoying entertaining myself in imagining said person doing every-day normal activities the look-a-like is doing. And I just watch them intently.
And I too have been caught, although I don't recall being confronted about it. When I first notice that they noticed me, I wish the ground opens up and swallows me. When it doesn't, I do the next best thing and disappear to where I'm sure they won't be seeing me again. You've got more courage than I do.
I haven't really seen anyone who looked that much like a Foster's character. That would be really cool!
