Found it on the kitchen floor, and can't figure out what the heck it's for... looks familiar too, but I can't place it! Aargh!

<img src="http://pictureposter.audiworld.com/10084/clip.jpg">

Hmmm actually that looks like the same thing that is used for my belt-driven garage door opener to connect the belt to some other hardware.

except usually they are purple

Our friggin' one year old pulls on anything he can get his hands on, so maybe it's from some kitchen appliance...

It looks like one of these:

<img src="http://www.conbear.com/images/circlip_range.jpg">

no not rly...i can't back that up

Drifting it around corners yet?<ul><li><a href="http://www.youtube.com/watch?v=zMLKCSqPSdk">http://www.youtube.com/watch?v=zMLKCSqPSdk</a</li></ul>

Just like pulling the E brake around corners! Lock up the rear!

How about a bigwheel?<ul><li><a href="http://www.youtube.com/watch?v=kZPpasP2acQ">http://www.youtube.com/watch?v=kZPpasP2acQ</a</li></ul>

I took the bike in because one of the links in the chain were loose, and the part that was missing was this one! DOH!

I never knew that there's such a thing as a master chain link, which has the same pieces as all the other links, PLUS this extra clip. So I never clued in when you suggested it might be from the bike chain links, because this master link still had the same pieces as all the other links, but was just loose.

I learned something new today! Mystery solved! I hate finding parts that I have no idea what they belong to!