Are there any games you like to play when you are feeling down or after a hard day?

Just Cause 2, just 'cause grappling people to moving vehicles (esp. jets) NEVER gets old

Terraria. The most addicting game for me since Dragon Age: Origins was released plus its early cheerfulness and easy-going nature lights me up.

Orcs Must Die! gets an honourable mention as well for the same reasons.

I love the following games, either due to cathartic violent actions, or humour...or both:

Day of the Tentacle
Grim Fandango
Full Throttle (never get sick of hitting Cave Fish)
System Shock 2
Plants vs Zombies
Godhand
and Good ole Deathmatching in Quake 3 Arena, or Unreal Tournament 2k4

Anachronox, for sure. The game's zany humour never ceases to surprise me. Just when I think I've seen everything, another ridiculous moment comes from behind the corner. :D

When I'm having a hard day I usually don't feel like gaming, but something like Quake Live gives a quick fix on needing to destroy something.

Monkey Island
Super Mario Bros 2
Zelda : Link To The Past
Portal 1 6 2
Chrono Trigger
Final Fantasy IX

Dead island for some reason

Curse of Monkey Island, because no matter how much life sucks, it can never be as bad as being a disembodied skull with fish nibbling on your feet at the bottom of the ocean.

Tales of Monkey Island!
The way Guybrush is a mighty pirate, but also a somewhat average person. He's always making a wisecrack or saying something funny. Wow, we recommend Monkey Island within 3 mins of each other. Great minds think alike!

Worms 2 or Amageddon.

Nothing cheers me up as some matches with these little cute worms :)
(Always using the polish speech bank, as it is the most funny language in the game)

a round of Ignition with someone on the same computer

I had a thread about this a while back, "feel good games."

Under a Killing Moon and King's Quest VI are big ones for me. Nostalgia overload is generally the best way to cheer me up. Same goes for 80's television.

Grim Fandango
Darksiders 1 & 2
Simon the Sorceror
Giants Citizen Kabuto
Redneck Rampage

I like to play something with a bit of humor to cheer me up usually.