You should give Full Throttle a go if you like point and click adventure games.

Portal 2, Stephen Merchant provides most of the humor with his voice acting for Wheatley.

The original psychonauts had me laughing all the way through, the sequel is also very charming tho it felt a little darker.

Battleblock Theater is really funny in like a slap stick and kind of juvenile kind of way.

High on Life is pretty good. Didnt get far into the sequel.

The funniest parts happen early on in the game too, imo it peaks when you collect the knife, so if it doesnt interest you by then with gameplay or humour its safe to drop it early.

Undertale* is a classic and must-play.

*might also make you cry

The classic Lucas Arts adventures. Monkey Island, Day of the Tentacle, Sam & Max, Grim Fandango.

Goat Simulator 3 is silly ridiculous. If you want to not think and just laugh at stupid/funny shenanigans, this would do it.

I Am Bread is amazing.

Grim Fandango!

Never has a game made me laugh out loud like when I first discovered it. Clever humour, unique characters, and each line of dialogue is packed with effortless charm and wit. Not to mention the philosophical themes disguised as one man’s quirky Day of the Dead -themed quest to get to the afterlife.

The puzzles are a product of its time so a walkthrough might be needed. But that’s forgivable for the game’s big picture.

Wish I could wipe my memory of it and play it all over again.

Journey To The Savage Planet has some decent giggles

Terry Pratchett’s DiscWorld

I really enjoyed the slapstick of jazzpunk. If that is your kind of humor.

Pizza Tower is pretty great. Every frame of that game is a hilarious work of art.

Turnip boy commits tax evasion was a surprisingly sweet chuckle the whole way through.

Esoteric Ebb is a d&d narrative RPG in the mould of Disco Elysium. It has sharp writing and parodies d&d tropes in some unexpected ways.