I can't look at a spool of cable without thinking about something that happened nearly 30 years ago. I was pulling some network cable (might have been something like RG-58 coax or something fairly heavy gauge). Another guy had the spool and a screwdriver or something similar through it so it could unwind while I pulled. He was bent over, holding the spool in 2 hands between his knees. What neither of us knew was there was a loose end on the spool, just long enough to whip around from underneath and smack him where it counts. I think it whacked him 4 or 5 times before he dropped it.