You have saved all your friends a lot of money. The computer 'joke' was not a joke at all -- it destroyed 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. Your friends are really glad that you did not send the 'joke' to them. Congratulations, you made a good choice!

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 that you had downloaded BEFORE you put it onto your computer's hard drive.