Same, playing Wasteland 3 put a smile on my face quite often. I would be even just checking item descriptions and read something that would make me crack up. They did great work.Right now it is Wasteland 3. Some of the dialogue just cracks me up, especially from the Sex Robot called "Little Sparrow".
Far Cry 5 did this for me. I've experienced more than a few laugh-out-loud moments during my playthrough, not least of which was during a mission where I was defending a farm from a cow invasion. Blasting the herd with a rocket launcher and seeing the cows fly had me crying! Ubisoft does this pretty well in general, I think. Spartan kicking a rando from a castle wall in AC: Odyssey always results in maniacal laughter.Portal yeah, always looked forward to GLaDOS's next reassuring pep talk.
The original Plants v Zombies also tickled my funny bone, between the crazy zombies and their armor & the cute weaponized plants. Crazy Dave, mashed potato bomb, Michael Jackson zombie, traffic cone & bucket helmets, etc etc—PopCap put a whole load of laughs into it.
The modern Far Crys are always liable to throw up hilarious ridiculous moments—bad guys getting mowed down by a cross cow, elephant clearing out an outpost all on its own, bad guy chatter, eagles lifting pigs up into the sky and then dropping them.
Rare? I do a lot of grinning while I play! Saints Row 3 was probably the funniest. That bit with zombies starting to wake from the dead where your tank refuses to start up... I'm glad the chapter ended because I had to laugh out loud for quite a while on that one! Armed and Dangerous, Anachronox (sp?), Tropico, Portal 1 & 2 (with the lemon!), South Park 1 & 2, and Yakuza 0 were also particularly funny. Many, many other games had lots of funny points, though.There are very rare games out there that just makes you smile, what's yours?
I found playing VR gave me a few smiles just for being a unique and cool experience. Moss springs to mind. The first PC game I've played where you can look around corners just by moving your head.
I need to move this one higher on my short listOutside of games that are supposed to be funny, Middle-earth: Shadow of Mordor had me smiling just from how extremely satisfying the combat was, made all the better by all the other mechanics in the game.
Not a game in particular, but the CD Gamer demo disks.