At an old job, we created some ” interesting ” ASCII graphics on a user signing into the system. Just a simple change to the “initial program” call in the user profile. Just created a simple green screen DSPF displaying some custom insulting message or graphics. If the hit enter it would take them to the normal menu. Then It would reset their profile so if they tried to show someone what came up it was gone.
Could only do this on people with a sense of humor..