That's not "funny" enough, unless the "!!" is replaced by an emoji.

    papln used multiple exclamation marks and is clearly insane. This incident will be reported.

I use it all the time! But also worth remembering that !$ is the object of your last command, so you could do something like

cp /some/tortured/path/to/file.txt /some/other/path/file.txt

chown myuser:myuser !$

Thanks for that little tip! It's a constant mistype for me...

    $ apt install something
    E: Unable to acquire the dpkg frontend lock 
      (/var/lib/dpkg/lock-frontend), are you root?

        $ foo bar baz<cr>
        ^P^A<esc>u
        $ FOO bar baz<cr>

That's three keystrokes less - even for the history (!!) version. :-)

sudo !!

As mentioned above, you don't need to retype:

        $ foo bar baz<cr>
        ^P^A<esc>u
        $ FOO bar baz<cr>

As for ^T, I'd wholly forgotten about bind, inputrc and all that- but of course both your proposal and the above can be put into an inputrc macro and bound to a key. However the all caps version is shorter when you remember you need sudo in the first place ;).

or use "sudo !!"

…is that a sarcastic question? How would typing 'YUM' NOT be faster than 'sudo yum'?

I can't deny that something feels terribly wrong about this sort of script, though.

I remember writing the title as

    ALL_CAPS => sudo all_caps

So it appears something did actually change it.