Don't think it's been done this way yet, but...
What if Lois and Clark (S1 or S2)got into a situation where they had to pretend to get married for their cover for a story. They have to actually go through with one of those quicky ceremonies, like at a Vegas chapel.
Clark is stunned, but Lois tells him she has it all covered. The guy who is going to marry them is just an actor she hired and not someone certified to be able to preform an actual marriage.
After the ceremony, the 'actor' comes running up to Lois to apologise for being late, but is ready to go then.
Lois realizes that a real official had to step in and take the place of her 'personal minister' and thus... they are really married.
Or, Lois gets the chapels mixed up and they go to the wrong one. She doesn't realize until later when she gets back to the room and checks her communication with the actor that they went to the wrong chapel.
Tank (who thinks it might be fun to watch all the chaos that happens that keeps forcing them to put off getting the annullment until...)
