Sometimes the simplest things yield the most fun results. This clever trick creates long, condom-esque plastic bubbles.
This How-To is very simple: Grab the plastic disk that comes with your blank CD or DVD spindle or scratch the aluminum off a real disc. Heat an area of it with a lighter. Blow.
Detailed demonstration here.
Russian girl demonstrates by blowing an amazingly long CD bubble:
Jesse's bubble in slow-mo: