Pschy-Doh.

Although it achieved fame as a popular children's toy, Noah and Joseph McVicker originally invented Play-Doh in 1965 for use as a wallpaper cleaner. Although Play-Doh's exact makeup is a closely guarded secret, it is known to contain, among other things, wheat flour, water, salt, and some sort of petroleum distillate.

http://www.youtube.com/watch?v=gvpl0qvTVlA&e

Ali G -- Bruno goes to a psychic.