Most embarrassing interview rejection was not even in person, it was over the phone.

The company that I was going to work for (quite a big one mind you), scheduled to phone me at 2PM, I was preparing mentally for 2PM, so I took my girlfriend to lunch at 1. Just to relax and calm myself before the phoned me.

It was 34 degrees (celcius - I think that's about 93 farenheit? somewhere close) outside and I was waiting for her to finish her smoke (she was in the smoking area).

They phoned me, and it caught me completely off-guard. My years of knowledge just seemed to flush down the toilet at that moment, and I utterly felt stupid talking to the guy over the phone. It was a first for me, and I hope that it never happens again - he basically stopped me, told me that I had better not apply before I know what I am talking about (as I was wasting his time), and then put down the phone on me..

Worst part was that my girlfriend came back right then and asked me if I am ready for the interview. I hung my head in shame because I was ashamed to tell her that I fucked it up, because you know, I kind of needed the job (the one I had at the stage was shitty).