I keep notes on all the interviews I have (mainly because I've had like 60 over the last 6 weeks and there's no way I could keep them straight). I wrote down in my little notebook during the course of the interview:

• AWFUL
• this could NOT have gone worse
• worst interview ever
• Ohmygoodness
• and various incoherent scribbles

I'm not kidding, I nearly just stopped the interview halfway through to thank them for their time and say I'm sorry but I am obviously not cut out for the job.