Introduction: TNT Cannon

By plus.google.com/1133854985065523

Step 1: Basic Build

Step 2: Water & TNT Cannonball Thingy

Step 3: Light 'em Up

Light the TNT that was added in the basic build step then wait about 3 secs then light the TNT cannonball thingy.

Step 4: Boom

Make the cannon as long as you like, although the longer the cannon gets, the harder it is to light all the TNT before some explodes...