Rolling Cactus

The Rolling Cactus is a placeable object that behaves similarly to the Boulder. A Rolling Cactus is stationary when placed, and will become the Rolling Cactus projectile and start moving when one of the following conditions are met:
 * When hit by projectiles, or hit with a pickaxe or drill, a Rolling Cactus will roll to either side, decided by its horizontal position in the world.
 * When both blocks underneath a Rolling Cactus is removed or turned into a half-block, it will drop vertically until it hits a surface, bounce, and roll to either side. The side it will roll to is decided by its horizontal position in the world, regardless of sloped surfaces, unless it is blocked from moving to one side by a vertical wall, in which case it will always roll to the other side.
 * When one block underneath a Rolling Cactus is turned into a half-block while the other is a sloped block with the slope facing upwards, it will roll off to either side, decided by its horizontal position in the world.

A Rolling Cactus projectile will pierce unlimited entities and break Antlion Eggs on contact. When a Rolling Cactus falls onto a lower surface with a horizontal speed it will maintain the horizontal speed and bounce back up, releasing ~2-5 Rolling Cactus Spikes that travel in random directions. When a Rolling Cactus hits a vertical surface, including the side of a half-block, it will break and release ~2-5 Rolling Cactus Spikes that travel in random directions. A Rolling Cactus's movement seems to be not affected by liquids. A stationary Rolling Cactus deals ~25 damage when a player touches it. A Rolling Cactus projectile deals ~70 / damage to a player, and ~70 damage to enemies, NPCs and critters on contact. A Rolling Cactus Spike released by a Rolling Cactus deals ~20 damage to entities, pierce entities and break upon contact with a block.

Trivia
- The Tooltip is a reference to the song "Ridin' " by rapper Chamillionaire. Popular memes have also sprung up from this song.