As I said before i'm doing a science project at school & I need to know how to get through glass, anyway, can anyone tell me how to SMASH glass, doors, windows etc, WITHOUT BEING HEARD?
Llamatron, the guys on Mythbusters tried the thing with the suction cup and decided it wasn't possible. I think the cutter made too much noise and the suction cups weren't reliable enough.
Kiwi, it depends on the situation. If it's a small-ish window, it's probably easier and quieter to remove the entire windowframe than trying to cut the glass.
But if you want to SMASH the glass as you say in your first post, cover the glass with sticky back plastic on both sides if possible and use a spring loaded centre punch. This will shatter the glass and the stick back plastic should stop the glass falling. Shoudl be fairly quiet too but I'd imagine it would be difficult to get the glass out...