The Chestburster from the "Alien" franchise had the element of surprise going for it. One moment, you're just sitting there. The next moment, an alien spawn pops out of your chest. ThinkGeek's April Fools' "Aliens" Chestburster-in-a-Can imagines that moment as a spin on the classic spring-in-a-can prank. It looks like a Colonial Marines can of cornbread, but it contains a springing Chestburster.