tpter1

I can think of maybe 2 possibilities: 1. your finger position was off just enough. Maybe because you were emptying your water or just got caught up and then had to race to get the horn into playing position (an oh crap moment); 2. sometimes cleaning a horn releases many evils into the instrument. Maybe a piece of gunk got freed up and decided it would be the appropos moment to make itself known.

__________________
-Glenn
"Roses have thorns; shining waters mud. Clouds and eclipses stain the moon and the sun; and history reeks of the wrongs we have done. After today, after today, consider me gone."- Sting