Yes! Final! Is Partial Compendium Latvian Humor Joke! You Await!
Joke:
Three men are in ship. One Latvian, one Russian, one Lithuanian. Lithuanian take out one bottle wodka. Russian kill Lithuanian, then drink wodka. Then Latvian wait until Russian drink self to sleep, then kill. Is end.

Joke:
Latvian: Is so cold.
All: How cold is?
Latvian: Very. Also dark.
( The Resident Loon Not a demographic. Do not measure., Fri 20 Feb 2009, 17:11, 6 replies, latest was 17 years ago)

MOAR!
Joke:
Knock knock
Who’s there?
Latvian.
Latvian who?
Please open door. Is cold.

Joke:
Latvian walk into bar with poodle under one arm and salami under other. Eat salami first.

Joke:
How many Latvian is take screw in light bulb?
Only one. Obtain light bulb is hard part. You have potato?

Joke:
Is dead dog in road. Is dead Latvian in road. What difference?
Dog have fur keep warm. Also, freedom. And dog try eat poop for pleasure not just survive. So many thing!

Joke:
Boy: But mother, I no are like grandma.
Mother: Eat anyway. Is no potato.
( The Resident Loon Not a demographic. Do not measure., Fri 20 Feb 2009, 17:14, Reply)

I had no idea you were such a terrible racist
What did Latvia ever do to you? You porcine descendent of a slave owner.
( Bert Monkeysex is waiting for the mods to delete him, Fri 20 Feb 2009, 17:30, Reply)

Ah, my friend
you are mistaken- Latvian is a nationality, not a race.

Q: what is happening if you cross Latvian and potato?
A: this is cruel joke. please, no more.

(Source)
( The Resident Loon Not a demographic. Do not measure., Fri 20 Feb 2009, 17:42, Reply)

I actually liked some of the jokes
the dog one made me chuckle.

I was being obtuse for the sake of it. Forgive me?
( Bert Monkeysex is waiting for the mods to delete him, Fri 20 Feb 2009, 17:44, Reply)

*grin* I knew that.
I was just playing along.

Related. Too bad the translations are not really what it says in the pictures...
( The Resident Loon Not a demographic. Do not measure., Fri 20 Feb 2009, 17:46, Reply)

My housemate is Latvian
She steals my food the fucking cunt!
(Dangerous Disco Trev Isn't my real name, Sat 21 Feb 2009, 12:11, Reply)