!ALERT! Running this program will result in your calculator erasing all of its RAM, which includes any saved programs. Run at your own risk. I built in a fail safe (Line 1) that will stop the program before it even does anything. Deleting line 1 will remove the fail safe.
PROGRAM:BREAK
:Stop
:"LOL "→Str1
:While 1
:Disp Str1
:Str1+Str1→Str1
:End
The way this program works is it assigns a phrase ("LOL ") to Str1. It then infinitely adds that string to itself. It also displays the string so that you can watch as your calculator is dying. :) This is quick and easy to program. Don't abuse it.