The melting clock in Salvador Dali's The Persistence of Memory is a familiar icon. One can purchase analog and digital versions of these clocks, hand-crafted by artists, but it is also possible to create one at home by recycling an old vinyl LP and following a series of simple directions...
Step 2: Preheat your oven to 220F/100C and toss in the record for a couple minutes. When it's thoroughly flopping about, yank it out and run to a table to do the next step. Run! It hardens quickly!
Full directions are at Instructables, via Anything and Everything.
Voila.