Hey Chopper, Buddy here.

I've been known to chase my tail too. I only do it in small spaces though and my mom can't understand why. My favorite place to chase my tail is on the little landing going down the basement steps. Mom always tells me it's dangerous but I don't know what that means. I've bonked my head into the wall quite a few times, but that never stops me. Mom said one of these days I'm going to knocked a whole in the drywall. I guess thats a good thing??
My tail is long and fluffy, so it's kind of easy to catch it.
Sorry you took a header off the couch little buddy, maybe you should keep 4 feet on the floor next time you try to catch that thing!