If the gentleman prefers, he could go full-on, strong-man, hopefully pretending only to execute his opponents and whole classes of people at a time:
"I'm very good at integral and differential calculusHey, he never claimed he could rhyme!
I know the scientific names of beings animalculous
In short, in matters vegetable, animal, and mineral
I am the very model of a very stable genius"
If he wants to go even more retro, he could try this one:
But that's King George III, so it would be just a little silly.
Flipping channels, he may have caught a glimpse of this splendid uniform:
Maybe we'd better let someone else have a say here: