This could be anything from a scripted quest event, or just a random little happening. For me the most fresh instance in my mind was a new piece of Serana dialogue I'd not yet heard. When travelling in the Soul Cairn, she said to me -

"I can't believe I found my mother alive. Well, you know what I mean." That made me chuckle a little

What about you lot?

Killing an enemy with Chain Lightning by aiming behind them. They just ragdoll through the air toward you or whatever direction. It's usually good for a laugh.

Firsttime I explores that cave that had vampires and the statue of clavicus vile heomirs shame I think it was called? It was so beautifull I loved it.

The music.. The night sky.. The screams of burning bandits lol.

It was a cold night in the marsh. I found myself in an abandoned shack. A lady there insisting I had a debt to pay; to kill one of her captives. Her folly about to be exposed, I killed all three, before turning and killing her as well. Her last words: "Well done." Still makes me smile.

It makes me smile every time the guard quotes:

Lots of Dark Brotherhood bits. Babette snuffing that perv. The werewolf guy's new loincloth. Also, Gabriella and the unicorn. Such a happy little incredibly dysfunctional family!

Actually I have to admit the night sky is awesome, I often have to tell myself "snap out of it" whilst gazing up. Lobbing the heads off bandits is also fun.

When you walk up to a guard with fists raised and they say- https://www.youtube.com/watch?v=H5GjlrRbpeg (so awesome that someone uploaded guard quotes individually)

The first time I heard that was probably past the 2 year mark so it made me smile to hear something new and humorous

Ragdolling from AoE spells.

People's reactions to being set on fire.

Ri'saad :3

Listening to Master Neloth ramble.

Meeting saint jiub and neloth. Ahhh, nostalgia

I had been playing maybe a couple of months or so when I walked into town wearing an ebony sword and a guard compared it to a sliver of midnight.

Hearing the wind wash over the plains outside Whiterun on a sunny morning.

The ritual at the end of Proving Honor where Farkas spoke for me.

Kinda got to me

Hold on; are you saying that guards have an indian accent in the english version? =D

I'm playing the game in german, but I don't remember hearing that phrase before. Probably because I never walk around without having any weapons or spells equipped.

Hmmm... what made me smile... quite a few things. Female characters complimenting me. Epic or funny moments. Just like today, when I came past that wooden bridge-thingie that crosses the road between Lakeview Manor and Falkreath, with the two bandits... one of the bandits began shooting at me with his bow while he was on the bridge... he slipped and fell down, which killed him. Or then Cicero... the quest where you help him with the broken wheel near Loreius' farm. He's hilarious xD. Sadly I'll never see more of him, as I just never will get myself to join the Dark Brotherhood. I just can't play evil characters (tried that for example in Fable 1, but I just can't... I tried but I just couldn't do it). Thieves guild is okay, cause I can somehow justify it with being for the greater good, and they don't actually kill people. But the Dark Brotherhood... never. But I'm getting side-tracked. ^^

The first time I was gifted an item in the game by an NPC Sven's mother Hilde gave me a fine hat. It was amusing since I usually walk around hood/hat/helmless.

Erandur's follower lines would usually make me smile, especially the one about Windhelm being freezing. Then there's Teldryn Sero with his humming. Speaking of which, what does he hum anyway? Is it a Morrowind song reference?