He/she owns a ton of high-quality cels (A-grade 
AMG, Nadesico, etc.) but has absolute disdain 
for the pencil sketches.

So when he/she finds a cel stuck to the sketch, 
he/she simply tears off the sketch--with no cold 
or water preparation to make it come off 
safely.  If the sketch is really stuck, 
he/she'll still tear it off (even if it means 
that some the paint is lost to the sketch) no 
matter what the risk.  In another case, he/she 
folded and wrinkled the sketch until it looked 
like newspaper in a recycle bin while in the 
obvious attempt to remove the sketch.

How do I know?  I bought such kind of cels from 
him/her in the past without knowing.

In addition, I saw him/her shuffling and tossing 
around his/her absolute top-grade cels at a 
convention one year like a deck of worn-out 
playing cards.

It's scary to think how people with a bit too 
much money can act sometimes...  Sure, they can 
do what they want with their own property but 
sometimes it's a darn shame (especially when 
they sell some of their stuff to other 
collectors).