Missing: Brain. If you find it, please return to owner.

Just now:

"Okay, I entered my registrationcode. Should I press 'Confirm' or 'Send new e-mail'?
Headdesk "Please press 'Confirm'. If you press 'Send new e-mail' a new e-mail will be send to you with a different registration code."
"Oh... Are you sure?"

You'd think this was a one in a lifetime conversation. Sadly, not so much. Variations on the theme include:

"If I want to change my password, should I press 'Change password', 'I forgot my password' or 'One-time registration'?

And

"What button did you press to change your password?"
"One-time registration."
"To change your password, you should press 'Change password'."
"Oh... Really?"

And our winner:

"Good afternoon, IT-helpdesk, this is Anne speaking."
"To upload a file, should I press 'Upload file'?"
"... That sound likely..."
"You're a hero! Thank you so much! Bye!"
beep beep beep