Here’s a perfume ad directed by Spike Jonze that is 3 minutes 45 seconds of WTF weirdness, and 3 seconds of advertising.
Anything by Jeremy Clarkson
I like the Geico youtube commercials that do a setup, tell you they’re going to cut to the end so you can watch your video, then cut to a weird ending that makes you wonder what happened. They’re cute and amusing, and short enough that they don’t get in the way of watching what you want to.
I will rewind and watch every single sonic commercial with the two guys in the car, specially when a new one drops.
The Reese’s Summer Olympics commercial with the skier trying different summer games and failing adorably. I especially like her rhythmic gymnastics and fencing tries. And how proud she is of herself once she gets on the horse.
I love this Clorox ad with the little boy who can’t get out of his belt.
Progressive Insurance
Biker’s double life.
“He uses my moisturizer.” 
I mostly watch on my Roku, so don’t see many commercials. But I really love the audible.com commercials.
Here’s an example.
You see a person jogging, or a person on a beach-- i.e., someone listening to an audiobook-- and the voiceover is text from the book. When the camera backs up, the jogger is at the head of a bunch of guys marching into battle, or the woman on the beach is sitting in a desolate landscape on another planet. “Stories that surround you.”
This commercial is brilliant.
The Playing Marco Polo with Marco Polo ad.
Love that one
“But it is I, Marco Polo!”
I like that, by the end, he figures out what’s going on. That Marco Polo was no dummy!
But why does he have an alpaca with him? 
Alpacas can be used as pack animals.
In fact, that’s where the name came from.
“Hold still while I pack ya.”
ETA: I’m pretty sure that it’s a llama.
Ahh, Polo!
The Farmers Insurance Synchronized Swimming Dogs (Mermutts)
No matter how many times I see it, I still laugh at the Clearasil commercial, where the Mom comes barging into the room with laundry and huffs, ‘Steven!’ all through his life until he’s 90 years old and a robot/hologram mom with laundry basket STILL comes barging into his room.
There’s one I saw a few times a while back with a bunch of dogs dressed up as hot dogs running towards people dressed as various varieties of catsup. I thought it was cute.
I just saw a Farmers Insurance commercial with a living room that, I guess, was flooded? and all the dogs jumped in and performed a water ballet. (I love Farmers Insurance commercials, they’re all entertaining!)
GEICO’s “Lemonade” commercial was funny. Once.
Now they’ll run it into the ground.
Cigna’s TV doctors is pretty good. - YouTube