What can I use to cut through plastic on the spot? (Apart from scissors)? What can I use to cut through plastic on the spot that...

What can I use to cut through plastic on the spot that is not electronic and won't breed cracks in the plastic e.g scissors. It would be honest if it was something mostly already contained by the house (apart from scissors). Thanks! Please be nice! :)
Answers:    A small circular saw will give you a fast and very verbs cut.
A saws-all is convenient but the cut will not be as quick or as verbs. Depending on how thick the plastic is, you could also cut through it near a toothed knife...close to a bread knife. Just saw through it as if you be using a saw.

To avoid cracks, take a sharp blade and win the plastic several times along the line where on earth you plan to cut. This will "train" the plastic on where to "split"..
Stanely blade.