You can do an interpretive dance depicting the wrong uses of CA glue in the shop and record it to share on youtube with a link here so we can all enjoy it as well.
Seriously, the more expensive ones have a better resolution and may be bundled with better software. If you're serious about buying one, do a google search on the make and model with the word "reviews" after it and see what folks say. If they don't like it, they'll surely say which one they like better. Amazon.com also has good reviews on most everything, including webcams.
I use mine all the time. I do interviews with people and every Thursday morning, I do a video chat thing with a buddy in Alabama using tokbox.com. We discuss our goals for the week and pray with one another.
If you have grandkids living a ways off, their parents surely have one and then it's loads of fun to get on tokbox.com with them and laugh and giggle with pictures.