Here's a quick command to crash your computer with Paint. Out of all the pre-installed windows applications, I found this one to be the quickest to crash my Acer Travelmate laptop. I don't know how this holds up on desktop computers, but If you want to do a quick prank on a friend, this is how.
Step 1: Create a New Text Document in Notepad
You can name it whatever you want
Step 2: Type in the Code
If you're too lazy you can copy it from here:
Step 3: Change the File Extension to a .bat File
This will make it open in command prompt.
Step 4: Disguise It
You can change the icon, rename it, make it an extension.