Walked past one of my employees as he was talking on the phone. He says something along the lines of "oh no that was totally my fault" to which I just blurt out "haha dumbass"

And he just goes O.o and then to the phone "oh, yes, no sorry, yes that was my manager" to where someone just roars out laughing on the other line.

Him: "apparently the director of X department found it hilarious that your standard automatic response was that out of nowhere"

Before I get called an asshole or whatever, my dudes regularly leave notes on my office with messages such as "die", "eat shit" etc. Its good fun lads, don't lose yer heads over it.