Unfortunate system failure, or "denial of service"? My conclusion: Gillette is ripping me off.

Well, I hate to go all "conspiracy theory" on you, but it seems to me like Gillette intentionally design their shaving foam system to die before you get all of the foam out of the can.

Too often I get part-way through a canister that stops delivering foam. After dismantling the container, I was surprised to find exactly how the thing works, and how little actual shaving foam you're getting for your money.