T-Shirt coverage from shoulder to shoulder

  So I'm looking up pictures of all the T-Shirts I wanted to include in this post and I found everyone but, - Intelligence is Key! Apparently you're locked out...
I can't help wondering if there's a message in that.
Starting out with some iconic figures.

I knew Tolkien got it somewhere.

And they thought it was just a typo

Che Chimp

And make sure the horse is sober too.

Okay - it's not a t-shirt... yet.

Here's a couple that made me hungry

How did that slip by?

And how did I miss that!

Oh... That's how

And speaking of brain failure

End of the dino reign (spelling?)

I'm so old now, that I don't even recognize it.

Yeah

Some folks ask when I'll ever get around to being funny

I'm getting tired of the crabby whiners.

I was wondering why cats are more popular than dogs these days

Can't argue with that.

It might work

Okay - some jobs you should hate.

I forgot what point I was trying to make, but I hope that clears it all up.

Speaking of clarity issues - this was a popular short 80 years ago.  Can anyone tell me why?