Heard a job position opened through a friend. Passed him my CV since we don't know his email (lol how?)
Got called for an interview + technical test. Came and they were expecting my CV. They somehow misplaced my CV (lol again how?)
Told the interviewers that I made a couple of apps for fun and informative. Tested me by doing a value switch between 2 variables without introducing a third variable. Done and dusted.
A month later, the company that interviewed me disappeared.

That's my definition of the worst interview rejection. Company pulled a Houdini without telling all of their candidates that we're rejected.