Just recently discovered this and Omegle with video. I do something similar by showing a collage of photos of Condoleza Rice, George Bush and Leonardo di Caprio making a similar gesture. Besides that I have a big nose. Putting the camera under it, showing inside my nose also makes them stop and gives "normal" people something to laugh at. At least it is interesting to see facial expresssions on both visual stimuli ;)

Not Open Source, but Microsoft Visual Studio did the trick for me when I needed to clean up generated javascript and html code of about 30MB.