The perfect companion for people who have killed every plant they own, the cactus is a rare and adaptable breed of plant. The word 'cactus' dates all the way back to the Ancient Greek word, kaktos, meaning mysterious, spiny plant. The cactus is one of a kind as it has adapted to and conquered dry desert climates, thus it has become a symbol of life in the American South West and Mexico. And if you think getting tattooed is painful, try sitting on a cactus some day. OUCH. Here are 13 cacti tattoos for those who live life on the prickly side.