I'm doing something quite fun just for the heck of it, it's very chaotic.
Go to a town, village, or anywhere you want to with NPCs friendly towards you, such as Whiterun, Solitude, or any similar place. Then open up the console, and type "tai" (without quotes) to temporarily disable the A.I. Once that is done, type "player.placeatme" (without quotes) followed by the base ID of hostile creatures or humaoids. For example, say... Bandit Plunderer, you'd type "player.placeatme 00037c3c 1" (without quotes, as always), the 1 at the end is the number of Bandit Plunderer you'd want each time you press enter after typing the code.
Do that any number of times you want, at any spot you wish a Bandit Plunderer to be spawned, all the while the A.I. (for everyone including the Bandit's) is disabled. Just place a few around town/village, for example one or two in Whiterun's market place near the inn, a few at the town's main entrance near the blacksmith, etc., and once you've placed them as you see fit then finally type "tai" again to re-enable the A.I.. Now grab some pop-corn, enjoy the show, or if you want be part of it.
As a side note, it's a good way to test some stability as well, since of course you'll have a greater number of moving NPCs on screen, but the A.I. will also run many more events at once. It can also provoke crashes obviously since many places are just not meant to encounter high number of foes, or sometimes just none at all. If you crash during such "experimental" fights don't be surprised and don't necessarily consider that your game is suddenly unstable, since it would well be stable otherwise. It's just something to do for some action.
I was doing that back when I was playing Fallout 3 and making my mod for it, I used to spawn a couple of Super Mutants in Megaton and watch NPCs running around and shouting at Mutants that it was "their town", good ol' times (but it crashed each time).
EDIT: Oh and some of the funniest moments I've had doing that was inside Whiterun's inn. I spawned some Bandits in there late at night (in-game time obviously, when many NPCs stop by inside to take a drink before going back home to sleep). The Bard sang Ragnar the Red and never stopped while the four Bandits I spawned were wrecking havoc (and seemingly ignored the Bard), I just couldn't stop laughing.