Carl's last correction is erroneous on two counts. First, *that* is fine as a defining relative pronoun. It is preferable to the non-defining forms *who* and *whom* where the antecedent is being defined by the clause introduced. Secondly, being wary of preposition-at-end is needless, affected, pretentious and stultifying.
*that* as used in the cartoon is not being used as a defining relative pronoun. In its series strictest sense, a defining relative pronoun would be "this car" or "that person," but in this sense, the correct INDICATIVE would be Which or Whom, since it is the object of the preposition..
The last correction is incorrect; "around" is a preposition also, so the proper correction should be "with whom no one wants to hang."
Or, "around whom no one wants to hang."
In this case, though, around is not being used as a preposition, because last I checked, prepositions don't modify verbs; around is being used to modify hang, as an adverb. "How do you want to hang? Just hang around. "
You can end a sentence with a preposition, the "rule" that you can't is a nonsense. Up with that shit I shall not put.
So glad everyone got the joke.
You guys must be very popular around the office.
There are too many Carls who belong to Grammar Police!
The whole preposition-at-the-end-of-the-sentence thing comes from German, where verbs often have "separable prefixes" that can be moved to the end of the sentence. For example, the verb "herumlungern" translates to "loafing around". The prefix, herum, is a preposition that can be moved to the end of the sentence when needed.
I'm glad you all enjoyed it enough to comment. I like to point out the stuff people say what ain't right. :)