Have you guys SEEN silly putty?! It's ridiculous! Ridiculously addictive to mess around with!
It has strange properties too, it is best-described to be partly solid partly liquid.
Here's the thing, if force is applied suddenly, it's pretty solid. Like if you stretch it out quick enough, it SNAPS. If stretched slowly and gently, it.. um. Stretches.
Sculpt something and leave it, and it starts getting glossy. Yuck. Notice how these sculptures become progressively darker each time.
That's due to the constant dropping or absorbing crap from all over the place.