Here is a relatively simple way to create lag switch.

YouTube - How to Build a Lag Switch (HD)

Why did I simply find a tutorial on youtube and post it here, you ask?



To gain posts? - Kinda, yes.
Because I've actually made it and tested it? - Yes. (And this is the main reason. I could have just popped in any random tutorial if I wanted to spam)
Household hacker have quite a lot of fake stuff like The High-Def speaker for under a buck , so it is a rare occurance to find useful working gagdets.