"I am the very model of...[fill in the blank]"

[med_cat]

Parodies of I am the Very Model of Modern Major General (43)

(via wendelah1 --many thanks!)

Other links:

The Major-General’s Song — Gilbert and Sullivan’s ‘patter’ is still twisting tongues, from The Financial Times

Major General Song, from TV Tropes

Gilbert & Sullivan Do Tolkien

The Modern Entomologist

...which inspired this gem, here in the comments: I am the very model of a modern criminologist

and, by the same talented author, We Are The Very Model Of A Drug Squad Metropolitan

I am the very model of a Russian Major General (not so funny, alas, but as the times are, so is the humor)

I Am the Very Model of a Cartoon Individual

I Am The Very Model of a YouTube Individual

Politics in General

Every Major's Terrible, xkcd comic

And the song it inspired:

Watch on YouTube