Firstly let me offer my apologies (and condolences for your recent and impending bereavements) to anyone currently playing Tomb of Horrors, I hadn't read this thread when I posted to the Guess the Monster thread.
Let me try and make it up to you.
DM: In front of you, filling the corridor, is an illusion of a Gelatinous Cube.
Player: Well I’ll ignore it then!
The Thing of Many Decks (new name given to a captured pirate galleon)
‘Conversation’ about an as yet unidentified –1 cursed dagger
Player: Throw my shiny new dagger at the goblin.
Attack roll hits
Next round
DM: The dagger magically returns to your hand.
Player: When?
DM: Before you can get another weapon out.
Player: Cool, so I don’t need to carry all these throwing daggers anymore…
And just on the subject of dice rolls the thing is no matter how rare they are eventually they'll happen, in my first lengthy campaign as a DM I ran a critical system for 1st Edn.
Grunge (for 'twas he) by then a 5th level half-orc Fighter was the first to strike in a fight that was happening outside an inn (The Haefod Aef Orc) because some of the up-and-coming bloods from the local thieves guild had found out the party had been freelancing.
Grunge: Attack roll = 20
Me: Woah, corking hit - possible critical.
Grunge: Critical roll 5th-6th lev Ftr. d6 = 6
Me: And a critical, roll d10
(At this stage the result is 80% a trip, disarm or knockdown essentially)
Grunge: d10 = 10
Me: Clap clap clap clap, this guy is in serious trouble.
Grunge: What now, we've not had a 10 before.
Me: Exciting isn't it?

d6
Grunge: d6 = 1

Me:

Waaaahahahahahahaaaaaaaa!
Grunge: What?

Me:

You just lifted this scumbag fully two feet into the air and pinned him to the wall with your longsword! He's currently sliding slowly down the blade with a very surprised look on his face. Critical Impale to the head, instant kill.

Grunge: YES!

Me: The others are scattering, one or two of them may have lost sphincter control, so what are the rest of you doing?

Only those numbers would do at that level: 1/20 x 1/6 x 1/10 x 1/6 = 1/7200
I've yet to see another one in fact (so I won't, I'd change the system a bit) but even if I did there's nothing quite like the thrill of the first showing.
That still only counts as one!