After watching last night's penalty shootout, I started to wonder if it's possible for someone to get sent off during it, and what would happen if they did. especially if it was the goalkeeper?

I don't mean the stuff last night was worthy of a red card, but what if the player lost their head and punched the keeper? Would you lose that penalty, or would someone else take it?

And what if the keeper somehow managed to get sent off? Would they let the other keeper go in goals, or would they have to use one of the players, just as they would during the game (if they'd used all their subs).

I realise the chances of this happening are slim to none, but it's been going round my head so wondered if anyone knew for definite.