Imagine going into the office and Margot Robbie is there.
i'd stammer without getting a word out. then feel like my tongue is getting dry and heavy and getting pulled to back of my throat. i'd try to recompose, remember that you should look people in eyes while talking to make a good impression, try to do that and fail spectacularly. as i'd try to tell why i'm there, i'd realize a black hole forming in my brain. i'd turn around, trip, fumble with door handle for few seconds before getting out and running like a maniac.
that the answer you were looking for?
Honestly, I can relate.
One time this dude taking my order was really handsome and I was caught off guard and I stumbled all over my words.