I've seen the same thing on I-30 while I was commuting to work. I averted my eyes away from him because I did not want to see it unfold when he splattered. Apparently doing high-speed wheelies is a fairly common occurence. Several folks I've mentioned this to have admitted they've witnessing the same thing. I call the idiots that pull such stunts, a self-correcting error.
I saw the same thing last summer. I'm doing 45 on a 4 lane, heavy traffic highway and I hear this motorcycle scream. I look in my rear view mirror to see this kid doing a wheelie about 100 feet behind me and still on one wheel when he flew by me.............I caught hell when I said I should have switched lanes. LOL!