It's amazing what you can stumble across on YouTube. I was looking for some max press-up attempts for my lad when I came across this. Funny, we were only talking about grip for benching here the other day and whilst I have tried thumbs on either side of the bar at different times, I am now sticking to a natural grip with thumbs opposing fingers. I bet the guy in the vid now wishes he did too.
Warning - this is not for the faint of heart!
Benching vid
Warning - this is not for the faint of heart!
Benching vid