I had one a few years back. I treated it really good but it was vicious. I had it neutered and that seemed to help for a while but then one day it attacked me and bit me. I had to put it down. The police came out and shot the thing. It shattered like a ripe tomato. The chia control officer suggested I spray the back yard with agent orange to make sure they got it all. Seeds sometimes fly off and grow into killing grounds. He told me of a chia plant they put down and then some of it fell in the lawn and grew silently. Then one night the owner heard a knock on the patio door. He opened it up and the chia plant had morfed into a giant climbing plant that pulled him out of the house and ate him. When the wife called the chia patrol officers out the next day, there sat a life size chia man in blue jeans and a tee shirt. They weren't buying it and got out the big flame thrower. They wasted it big time. And let that be a lesson to all chia owners. You never know when you have a bad one.
That would be a great joke... and yes, it's ugly. But no, I've never owned a Chia Pet - I was just happy I could keep bamboo alive. Maybe some day - though it's cheesy. (I think I should try cacti next.)