You send the computer "joke" to all of your friends. Unfortunately, it's not a joke at all -- it destroys the computer's "hard drive, " which has copies of the operating system, and all personal files. It is very expensive and time consuming to restore a hard drive. Everyone is really mad at your friend, until an FBI agent shows up in the middle of your Science class one day and empties an entire can of pepper spray into his face at point blank range, belting out a flurry of frantic raspy curses and thrashing around menacingly. He kicks your friend down and throws his desk out the window. The desk falls 12 storeys and hits an innocent passer by on the head, killing her instantly. You feel very ashamed. This was your fault. You are traumatized beyond repair and eventually institutionalized.

Think about it:

Computer "viruses" (programs such as this one) do a lot of damage to computers every year. This damage is very costly to repair. Be careful whenever you "download" (copy) a program from the Internet. It could have a virus. Use a virus scan program to check out the program BEFORE you put it onto your computer's hard drive.