On webcam covers

So…I guess this might be a naïve question, but what in the hell are people doing in front of their computers that requires a cover to be placed over their webcam?  If someone somehow managed to hack my camera, they be treated to my face. Me drinking water. Me drinking coffee. Me eating cereal. Me typing out a weblog. Thrilling stuff. Enjoy webcam hacker, I hope it was worth the effort.