Ouch.Yes isn't it a strange phenomenon, the bigger the hammer the more you hit your thumb .
Felt sorry for my mate yesterday, thumb just back to normal & no black nail so he's landed. He'd only been showing us 5 minutes before how well it had healed, then the idiot picks up a 16oz ball hammer to whack out a bearing & hits the same thumb.
.
Buy the man some long handled pliers