this was a long time ago so forgive me if the details are fuzzy...
We were fighting a a BBEG and his massive amount of mooks, finally all of the mooks are down, the BBEG is down to one hit point, all on the party is at negative hit points except the Bard. The bard has zero level spells left and that's it, it's his initiative, and the Bard says 'the spell mage hand can lift 5 pounds right? So I can do five pounds of pressure right? I reach out with mage hand and sqeeze the BBEG's nuts!'
The Dm, and the party, have a laughing fit for about 5 minutes. And then the Dm says roll for attack. The bard roles a natural 20. We all laugh again, Dm says road to confirm, natural 20. The Dm says for grins and giggles roll one more time... (Now I was not the Bard, I handed the bard my specialty d20 that I kept only for special circumstances... no it is not tricked out, it just rolls d20s a lot. I had to go through like 30 d20s to find the 'good one' and I keep it for special circumstances) and surprise surprise he rolls another natural 20 so we kill A BBEG with mage hand.