If you meet your idol or fave singer or whatever how would you react?

I am really getting my hopes up that I'll meet one of the band members from MCR when I go to their concert even though my friend says I probably won't since the place is way to big for them to use the back door or whatever sooo... If you actually met your idol in real life how would you react? I know I would like loose my breath and be like "I love you guys you're my favorite band ever and the show was amazing! Can I get a picture?" Then I would get super nervous when I got close tot hem because I saw in some videos when people met them they're so nice and stuff. -3 So how about you? And if you have met your idol how did it go?