A couple of months ago I was asked by centre to try and contact an aircraft on xxx.x and on 121.5 and if I got hold of them to contact centre on zzz.z. When I tried to contact him on "Guard" I specifically called "abc, def on 121.5" .... I still had some peanut inform me that I was on "Guard". FFS, I know.....
I can see it now, he's sitting there, with PTT in one hand and d1k in the other, feeling smug and superior but vowing to be faster on the draw next time, so as to get in first
Thats gold!
A pity it's probably true!