It's hard to define the "worst commercial ever made." But I think I would suggest that some good qualifications for the title would be (a) being incredibly unfunny; (b) featuring things that no human would ever say; and (c) being really creepy. Congratulations, AT&T: the only way this ad could have been worse is if it were also racist.
Black guy's thumbs: "Funny is knocking at the door, and he wants to partay!"
This is not funny. It is not something anyone would ever say to indicate that they found something funny. And good God, those thumbs with the faces on them are creepy as fuck.
Nerdy white guy's thumbs: "That's insanium in the cranium, dawg!"
Goth girl's thumbs: "I'm laughing on the dark, abysmal inside. Heh heh."
Ugh. Hey, goths like dark things! You knew that, right? Please let this end.
Guy with a hat's thumbs: "Shake your funny-maker. Shake it. Shake it hard."
I would like to shake the person who wrote this ad hard. And slap them across the face a few times.
Blonde woman's thumbs: "If they bottled that kind of funny, I'd buy it! Hilarity, by Daryl."
The bottled version of this ad: "Crippling Head Pain, by AT&T."
Announcer: "How would you say LOL?"
Not any of those ways, not in a million years. And neither would anyone else. Ever.
Announcer: "With a full keyboard, it's easier to text it how you say it."
Oh God. That's the point of this ad? That is all you were using this ridiculous bullshit to sell? Guess what - even with a full keyboard on a computer, when I indicate that something is funny, I might type the onomatopoeia of a laugh. I would not, in a jillion fucking years, write that something funny my friend said was "insanium in the cranium," and anyone who would should immediately be euthanized for the good of humanity.
More importantly, why did they have to use the horrible, creepy talking thumbs? God, they're awful. This ad was written, produced, looked at by probably dozens of people, and apparently not one of them said "This is really awful" or "This isn't funny at all" or "Those thumbs look like garbage and they're terrifying" or anything. Or, which would be worse, these things were said and AT&T just figured that the public at large will laugh at anything. Based on the YouTube comments, it seems like that might be true. Gag.