I have a couple of common ones:
I keep all my boxes and keep the plastic bags from each set in the proper box. I don't know why. I suppose I should get around to recycling them.
Every so often, the house must absolutely be patrolled by whatever SW LEGO I have handy at the moment, meaning that some nerd-rage-inducing combos have occurred, such as the 6208 B-Wing with the Batwing. Try making a simultaneous clean landing with both of those craft on the appropriate stands.... X-D
Finally, I will make sound effects, in a store, for "fierce" figs or creatures in sets that I haven't yet purchased. Example: Today I saw the Dwarf Mine set for the first time. Had to make the "RRR!!!" noise when I saw the troll.
Same goes with any other set I own. Shark? RRR!!. Wyvern Dragon? RRR!! Sea-snake? RRR!! Skeleton Knight? RRR! Jar-Jar Binks? (nope...gotta draw the line somewhere). X-D