I backed into one a few years back and it took the nurse about an hour to get all the barbed hooks out. All puncture wounds I couldn't walk for a week.
Oooooh that hurts just reading it, Lud. Hope it didn't make you turn your back on cacti. ;-)
Forest therapy, phemerons (sp) makes us comfy, and trees are very well grounded beings.
It took my neighbor a bit to get used to seeing me hug my trees after he first moved in but now he is totally copacetic.