My coworker wanted to get some program from a website that requires a username/password to download. It is a utility program for controls automation. He didn't want to have to create a username/password so I said he could use mine.

I went over to his desk and read off the username to him which he entered. Then I started reading off the "password" to him:
"y o u r m o m i s a s l u t"
He got suspicious at the last few letters and then clicked on "show password" icon. He of course saw: "yourmomisaslut". At this point he just bust out laughing. I then gave him the correct password.