McNabb was a guy with lots of physical talent but dumb as a stump on the mental side of things. When he finally gets to the Super Bowl he parties hardy the night before the game and gets so dehydrated that in the second half of the game he was so worn out he couldn't even run a two minute offense because he was sucking wind...
That sounds like the PHX Suns with Barkley. They’d stay up partying all night before playoff games, and sweat like pigs the entire first half until they shook off their hangovers.
Heck, they had to have the refs save them against the Lakers that one series.