Unusual movement indications.

[JimL]

Mozart was one of music's original jokesters.  He HATED the flute, or so he said.  I find it entirely likely that he was ribbing Cambini, just as he put all those joking asides to Leutgeb into the finales of his horn concertos.

[fyrexia]

Here are a few for the game.
Sorabji Desir Eperdu - Moderament Lent - Comme un Tormente d'une desir insatiable
Shchedrin - Sonata No.2 Mov 3 - Presto Possibile (try to play it like a midi ?)
Shenshin - Piano Sonata Op.10 - Con Slancio - Tragicamente
Pouishnoff - Musical Box - Automaticamente (i am not sure how)
Feinberg - Sonata No.2 - Allegro Volando y Cantabile (flying and singing at the same time is not so easy)

[eschiss1]

(as to Mozart, I think the guess that he hated being commissioned at a time when he was courting may have been closer to the mark - but it is no more than a guess, for all of that.)
Nielsen's probably already been mentioned - Sorabji (I do not try to deprecate his music, of which I am a great fan, in saying this) I consider partially, partially, a "descendant" of Scriabin when it comes to movement headings- but I may be mistaken there.
Trying to remember whose work had the paradoxical "Allegretto moderato" (as in erm- ok- in which direction?.. as discussed on newsgroups back when I was in college) - not Rossini's Stabat Mater, the closest it seems to come that I can tell ( on a skim, I may have missed it just now) is Andantino moderato at the opening. Though a search reveals an Allegretto moderato (for string trio, in D, ca.1864, first published 1967) by Tchaikovsky and similarly titled works by others. Still seems to raise the same question.

[britishcomposer]

Another Rued Langgaard? Here is his 3rd String Quartet of 1924:
1. Poco allegro rapinoso [robbing]
2. Presto scherzoso artifizioso [artificial or affected?]
3. Tranquillo – Scherzoso schernevole [mocking] – Tranquillo – Mosso frenetico [frantic] - Maestoso