Don't have a chessclock, but you do want one?

I was looking for ways to use a chessclock for OTB play, without having to buy one. Thought it be handy to share a couple ways to do this:
 

If you got a laptop + internet:
You can use online sites. Google for "free online chessclock" and you'll find a couple. Here are two of them:
http://chessclockonline.com/
http://www.online-stopwatch.com/chess-clock/

If you only have a laptop:
Download free software. An easy to use program is Virtual Chess Clock. It can be downloaded for free from open source website Sourceforge:  http://sourceforge.net/projects/vchessclock/?source=dlp 

If you got two cellphones:
All cellphones have timers. You can set them to a specific time and count down. When you end your turn pause your phone and let the other continu. This is not extremely accurate and you can´t use any increment ofcourse. More suited for long sudden death games.

There are probably Apps for smartphones and tablets too, but I don´t own one so I cant tell what´s usefull. Have fun playing :)