In my college physics lab we used play-doh as a resistor - figuring out how resistance changed with varying surface areas and the like. Also measured whether there were differences in resistance among different colors of play-doh. Needless to say the play-doh got pretty fried at the points where you connected it to the rest of the circuit. Of course the play-doh was used more for constructing artistic masterpieces than using it as a resistor!

Now, why am I paying 40,000 bucks a year for this :x :x :x I had my final earlier tonight too - that was rough - and no mention of play-doh resistors - in fact very little problems dealing with dc circuits at all, the only stuff I was really good at!