Note: This will not work since everything will be spoiled anyway because you'd have to spoil it to know there is a spoiler to warn against haha.
Note 2: Bahahahaha
How is this possible?
You will need:1 x Pig1 x Ground1 x Human
Method:Sit down behind the pig and lift the back legs off the ground. Wait until the pig is wriggling and squealing to satisfaction, and then release.
Result: The pig launches away from you as fast as possible.
Though not the most accurate or powerful of cannons, it works for me.
*looks expectantly at airhead*
But if I stare at it for a while and imagine it doing seal stuff then I get a tug at my cheeks