I guess I'm in the minority with this opinion, but I don't like going to theater alone. Sure I do it occasionally, but mostly I go with my friends. Of course there's the aspect of intermission and post-show discussions, but there's another thing too and that's the way seeing a single unique performance can bond two (or more) people together in intangible ways.
I think of this off-Broadway bizarro campfest called Archbishop Supreme Tartuffe starring Andre De Shields that I saw with one of my good friends about seven years ago that to this day we are flabbergasted by what occurred on that stage! I could sit down with anyone of you for two hours to try and explain what it was like to be in that audience, but it wouldn't do any good. You had to have been there. Even if you were at a different performance it wouldn't be the same, especially since audience participation was involved, making the experience all the more unique. My friend and I are forever bonded over this experience, as well as the 30 other people in the audience that day. That's one of the great mystical powers of the theater and why the ephemeral quality of a performance is so alluring.
When you see shows with the same friends (a spouse, family, etc) over the course of a year, five year or multiple decades the bond between you becomes something very special indeed.
Marie: Don't be in such a hurry about that pretty little chippy in Frisco.
Tony: Eh, she's a no chip!