The opposite of "Things that Annoy You"

Typos, especially those that hint at explicit things if interpreted in certain ways

Irony, period

Inside jokes

Funny signs

Stupid commercials

Ads with misrepresented items

And so many more...

Let's see here...
When morons doing moronic things at school get yelled at.
When that one kid sends a wise crack toward a teacher but the teacher doesn't understand.
Good yo mama jokes: "yo mama so fat, the world DOES revolve around her."
Basically what you said, after this, ace.

Being bilingual, translation mistakes can be quite funny.

Especially some inappropriate things from Chinese menu translations.

When Youtube closed captioning really "messes up". I have seen some pretty inappropiate and rude things the Youtube captions have shown. 
If you want a good laugh,
Step 1: Find a video with talking in it
2:Turn on CC
3:Enjoy!

LOL yeah, Google Translate can be hilarious!
Bratty Kids throwing tantrums
Arguements
When other people laugh, and I don't know what they're laughing about, I start cracking up!
Peoples' other silly ideas, or spin-offs on my silly ideas I've shared with people

-Drug commercials with never-ending side effects, and they say things like "sideeffectsmayincludeexplosivediarrheaandinabilitytoeatorbreath" and you are like "Wait, WHAT!?
 

Those are just funny to imitate!

Careers and Portfolio is another one. 

Or when hank hill has an epic BWAH moment or when he threatens to kick your ass I tell ya hwut.

Drunk/high people!

This. Enough said.
It apparently has a "motion sensor", something that a 50w PSMH lamp is sure to enjoy.
I once saw a flood (was either MV or coated MH) with a motion sensor below it.  

No, I saw a cheep utilitech yardblaster on eBay for $140 versus $30 in the store.

That's hilarious!

Things that make me laugh: (More of them)
Funny voices/silly theatrical impressions (I do them all the time too)
Other people's terrifying stories (I laugh in an "Oh geez" way, though, not AT them). 
Ads (Craigslist, etc) with misrepresented or overprices items (Or both!)

Yeah I say oh jeez or wow instead of laughing. Here's a good one: seeing an advance brand ballast on eBay labeled as "Advanced transformer co". 

And that can be abbreviated as ATCO (whic actually is the name of unrelated European ballast manufacturer)