So glad this got brought up, Langan!
As some of you know, I am Josh Sharp of UCB Lloyd Team "Spooky Ghost." We perform at the UCB-East Theatre in New York City's East Village. Though that theater is a wonderful performance space (and I'm with you on those bathroom doors!), we do not have the luxury of having a door on stage. Thus, when I wish to enter through a door into, say, a doctor's office or a board room meeting, I am often forced to "improvise" a door. I do this by creating the physical space of a door in my mind, imagining that "door" in such a way that I can make it real for me, then manipulating that imagined space with my body or with other imagined objects I see in that environment. I try my hardest to be consistent with the type and placement of the handle, as well as the angle at which this "door" swings out. Big kudos to the rest of Spooky Ghost, who I find always do a great job of noting the door I have created and respecting that reality if they should also need to enter the scene through the same "door."
So I would like to nominate the door I create in my mind to enter a scene and the rest of Spooky Ghost uses as one of the best doors in the scene. Specifically, I am thinking of a door I created in a recent set in order to walk out onto the stage of a beauty contest and eat a lot of hot dogs.