Sorry if this doesn't count.
When i played the Sims 2 today, i noticed the game coincidentally played all of my favorite OSTs in a row (brick sim, arch of the sims, arch of the sims adam freeland, arch of the sims nick frageland). Also, the game never blue screened. That's what made me go Awww.

(i thought to myself... "Although The Sims 2 is not a human being, could this be the game trying to tell me 'I Love You'? Maybe video games have sentience after all?". Well of course, The Sims 2 is just a video game with no sentience whatsoever, but i had a silly thought about it. I like to think this is The Sims 2 telling me "I Love You". Well... Sims 2... I love you too!)

Couples cuddling under the clouds/stars, especially if they do so autonomously.

My most favorite romantic interaction by a big margin. Most other interactions I would rather interrupt, but cuddling like this, I won't hesitate to take snapshots and let them enjoy their sweet moments together.

I love when parents autonomously walk into their kids' bedrooms and tuck them in.

Updating my video drivers made Sims 2 stop pinksouping as much. Nice surprise.

I love how sims stealing newspapers will first stop and look around all sneaky as if trying to make sure no one can see what they're doing, but then they'll just snatch it regardless, even if there's a bunch of sims around looking right at them.

in all my years no sim had stolen my newspapers *yet*
they're always kicking the trash bins! especially that boy Dustin Broke

You have mocked the gods of fate. Expect your newspaper to be gone within 24 hours. XD

I just had my first (as far as I know) pregnant sim get that-sneaky newspaper-stealing-gait and I almost wished her pregnancy had lasted longer because of that...

The impromptu flash mobs that form whenever a stereo is turned on at community lot.

Watching whom my Sims are dreaming about.