When two of my friends were getting married (to each other), there was of course a lot of effort spent on finding the right wedding location. To relieve the tension, when we got together, we would amuse ourselves by coming up with guerilla wedding locations, which was our term for surreptitiously holding a wedding ceremony at a location without the site owner's knowledge. Everybody would converge on the designated location, wait for the secret signal, and then spontaneously assemble for a wedding ceremony, wrapping it all up before anybody else knew what happened. Here are some ideas in the Seattle area we came up with:

Even now, with the wedding planning a dim memory, when we find a particularly nice location, we still find ourselves turning to each other and saying, "guerilla wedding."