One of my first real interviews was for a High School teaching job. It was down to me and 1 other candidate and the task was to teach a group of 13 year olds how to safely (we'll come back to that) use a craft knife. I was second up, so waiting my turn when the doors fly open and out rushes the other candidates (kids screaming in the background) with blood pouring out of his finger. I'm then ushered into a class of kids that look close to fainting to 'teach them how to use craft knives safely.' I didn't cut myself and the kids kept all of their fingers too so I got the job :)

Just as I was interviewing remotely to come into the UK, I got into an interview where I could not understand a word from one the interviewers. He is, in fact, British, but, to this day, I still don't know from where exactly. Luckily there were others in the interview that would rephrase his sentences in a way I could understand. I thought I would surely fail after the interview. I guess the task failed successfully for me. I got an offer instead.

I was interviewing at a well known tech company. The stage required extensive use of a whiteboard for the duration of the interview for system design. Due to unforeseen circunstances I was stuck last minute in a different country with no access to anything of the sort. I did have duct tape, a broomstick, some white papers and a crappy webcam. I MacGyvered a whiteboard from all of that and passed the interview. I am now a firm believer duct tape fixes everything. (The proper funniest interview moment is unfortunately not E rated)