All about a door

This was actually the same campaign as the last story about the magic weapon. The party mage had received early on a Robe of Useful Items. basically its a robe with a bunch of patches that you pull off and and they become various medium to large useful items like ladders, rope, hammers, that sort of thing. 

Robe of Useful Items: This appears to be an unremarkable item of apparel, but a
wizard who dons it will note that it is adorned with small cloth patches of various shapes.
Only the wearer of the robe can see, recognize, and detach these patches. One patch can
be detached each round. Detaching a patch causes it to become an actual item, as
indicated below. A robe of useful items always begins with two each of the following
patches:
dagger, lantern (filled and lit), mirror (large),pole (10-foot length), rope (50-foot coil)
sack (large)
In addition, the robe will have 4d4 items which must be diced for. Roll 4d4 to
determine how many additional items a robe has and then percentile dice to determine
specific items:
D100 Roll Result
...
09-15 Coffer (_' x _' x 1'), silver (500 gp value)
16-22 Door, iron (up to 10 feet wide and 10 feet high)
23-30 Gems, 10 of 100 gp value each
...
Multiple items of the same kind are permissible. Once removed, items are never
replaced.

The mage carried this robe around all summer int he game and in the climactic battle with a lava dragon in the base of a volcano he cast fly on himself. flew up 300' and pulled off the patch for the iron door and dropped it on the dragons head. Now there was much discussion about how to rule about this finally we decided that the dragon would take something like 30d6 damage if the door managed to hit him, the mage then proceed to roll a natural 20 on the attack roll which in my game means a guaranteed hit and maximum damage. The dragon ended up taking 2/3rds of its hitpoints in damage.

The Price of Magic Weapons

Another story from games past. Back in college I was running a small campaign over the summer with some of my friends. Things were going fine we were several dozen games in. The party ran afoul of a stone golem at one point. The party went to town hacking away at it. I said nothing and recorded damage like normal. I would write most of the damage in black pen and a few hits in red pen. After the damage totals were well over 200 hitpoints the players started going WTF is going on.

 For those of you that don't know stone golems are one of the rare monsters that require a magic weapon to deal damage to, normal swords hit it but just don't do it any harm. After a few minutes of trying to figure it out the players suddenly realized what was going on. Most of them had a magic weapon that wasn't optimal for them so they switched. One player who didn't have anything then said, "Man I'd suck a dick for a plus 1 sword right now" This phrase has become a catch phrase for anytime the players really feel like they are getting screwed by the game rules in my game.

One of my stories

One of the better stories from my group came early on in college. Two of my players were playing their rogues Mickalen and Stern and had snuck into a temple to steal some macguffin or another and they ran into the head priest in his bedchambers. A scuffle ensued and Stern engaged the priest toe to toe. The second decided to go check out the closet and see if the object of desire was in it. When Mickalen opened the door a 7' tall golden golem was inside. Mickalen quickly closed the door but the golem having been activated punched through the door and shattered it. Mick ran around the room being chased by the gollem at one point slitting open the feather bed with his knife and doing a elbow drop on it to create confusion then sliding under the bed. the golem however decided to stand on top of the bed and it collapsed with him underneath. In the end the golem turned to dust once the priest died and they decided to collect the gold dust to sell or whatever at a later date. This encounter had such an impact on the players that for years aftarward Mick would tell random NPC's about the time he faced down a golden golem all by himself. The hilarious part is with every retelling the golem grew a few inches by the end of the game the golem was 50 feet tall breathed fire and shot fireballs out its ass