This happened about a year and a half ago, it still cracks me up.
RaMuL had to have been "auto-climbing" in a Hog.  I was level off of his 6 for about 10 minutes.  He never saw me, I got to within 100, he was still auto-climbing, I lit him up!   I figured "This guy HAS TO BE afk".   But, RaUmL comes over channel 1 saying "You sneaky SOB!"   I spit my coffee on my monitor.   He forgot to check his 6 for the length of time I was at his 6, from about 15k out.  
I miss that Crotchety bastid.
Karaya