A while back I got two wonderful cels from the 
original Project A-ko movie, which was one of my 
first anime experiences.  The cel of A-ko I 
willingly purchased with a stuck sketch (that 
doesn't sound like much, but I DESPISE stuck 
sketches) When I got B-ko, I could see that she 
had been stuck to her sketch at one point, as 
there were peices of the linework that had been 
pulled off in spots.  It's not too noticible 
unless you hold it up to he light, and with the 
black background in the cel book, you can't tell 
at all.  However, I cn't bear keeping cels that 
arrived damaged due to mailing ;_;