I administer Atlassian stack instance (among zillion other things, of course). Once I've got an issue about login problem:
"I can login to Confluence, but not to Jira, could you help me?"

Looking into projects configuration, into user's permission groups in Crowd (both apps are connected, it will be important in a moment)... Everything looks good. Wtf?

Suddenly, I've got this idea:
"What username do you use in Jira?"
"My username."
"What about Confluence login?"
"My email."

Realization in 3... 2... 1...

Wait for it...

Just a little more tension...

"Nevermind, thank you!"

Remember, guys, always give them a chance. Plan for the worst, but hope for the best. And I wish you all only such issues! :-D

A meeting, non-technical PM to me:
"Could you borrow me your laptop? I haven't taken mine and want to make some notes."
"Yeah sure" I said, launched some text editor and turned the laptop to her side. During this motion other colleague had chance to glance at the screen. His eyes opened wide with mix of horror and WTF look:
"What the... That's really not good idea."

Turned out I was in complete autopilot mode and pressed Win key, entered "gvim", accepted by enter.

I've launched Vim.
To a non-technical person.