This one still makes me laugh to this day. I had been troubleshooting an client server application with a client over the phone having him work on both his server and client pc. Client is no on the server.
Me: ok go to my computer
Client: two seconds
(I hear the phone put down)
Me: (confused) hello? ... Hello?
Client: Sorry k back at my computer
Me: Pushing mute just in time to hide my laughter, then coming back on in my calmest voice I could muster, sorry sir I meant... my computer the icon on your desktop....
Client: Oh shoot... I thought... heh... two seconds
That call made up for the shitty day up until that point.