Hi Eashort,
After sleep and more reflection, I'd like to add some more.
The gloves and mask etc at the start in the second draft is unnecessary as you already lay the necessary clue in the dialogue - the fact that he says "Anybody home?" is much more of a strangers or acquaintances greeting.. in such an intimate household, ie, marriage and family, I am betting that he would more likely say his wife's name, if it were John. Besides, this is a punch line sketch, and by showing the gloves etc you give away the punch line.
If it were staged as a play as well, it is great as a one-hander. (one actor) The addition of another player right at the end is flimsy. If I were setting it on a stage, I would cut the first bag laying down scene, have the actor speak from off stage and enter into the bedroom. Snap black out on the punch line, after a beat. The punch line of course being the physical action of filling the bags.
For a film.. if you were going to keep the second player, again, to introduce him at the end is messy. Perhaps just a simple ruse of seeing a micro scene outside the house, of a key being put in the door. Here you could have the gloved hand to hide the immediate identity of the person entering the house, and not showing the person at all, other than that. I like the idea of a shocked and still response from John, too, if you were going to go with that. People do act strangely in crisis, and it is rather over done to have the high action high decibel "who are you in my house" kind of scene. I think it adds more of an element of humour, to have him stand there like a stunned mullet. But then I like such films as "Little Miss Sunshine" so my humour is perhaps a bit obtuse. Again, I guess it depends on the audience you hope to target with such a thing; I would clarify that in your mind strongly, I think it would help with your scripting choices enormously.