A reason why things such as: websites not dispaying correctly (wrong font size, PNG images not working correctly), web browser crashing, cookies not being saved, etcetera, usually occur. Can also be applied to nonsensical situations, see the chewbacca defense.
Joe: This website is all messed up, the font size is too small, and the PNG images don't render correctly!
Jill: IBYUIE, Joe.
You’re saying as a police officer assigned to the S.W.A.T. Unit, you were afraid to enter the classroom where students were being slaughtered ?” IWYSUF !