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I like the spontaneousness of being the DM. My players can surprise me with "Hey, I am gonna throw grenades and detonators to blow up the reactor of a capital ship." and they pass the skills checks.
I want to get back at them with the spontaneousness. Any tips? I know there are like "randomizer" cards for D&D.
Best way is to force them to deal with the logical consequences of their action. It's even better if it's a consequence they hadn't thought of or planned for.
If the logical consequence is a TPK, you can go with that, or throw in some Deus ex Machina to save the PCs and keep the game going (but penalize the players in crafty ways).
(edit) Didn't read the question correctly. If you want to throw spontaneity at them, I have a few ideas:
Make a chart ahead of time and then roll for what happens -- if it's something that would TPK or make mission completion impossible or a cinch, you might want to re-roll.
It's hard to prepare for unexpected player actions. The easiest way is to look at what the players did and find logical/unexpected results from their actions. More then likely they were expecting result B from action A. But what about result C instead or along with result B?
Additionally throwing additional complications in can make the story interesting as long as you don't suddenly make something impossible to do.
Relating to the example with the reactor: Assuming the player's "goal" is to blow up the ship once their grenades have gone off an engineer attempts to eject the reactor core to save his ship or guards come to investigate the explosion. Also the players might have trouble getting back to the ship due to explosions/loss of power.
