Today during piano lessons, I was playing 6 Dances in Bulgarian Rhythm by Bartok, I didn't practice it that much (was busy learning Pathetique during the week). The piece was full of complex and irregular chords, I didn't exactly learn them, and the melody line was tripped with double sharps, weird rhythms etc.
I faked my way out by bashing random notes, holding the pedal down, and make irregular rhythms.
Then I convinced the teacher to review the Pathetique instead.
Whew. She would have flayed me.