Chris, you could be right, but...

I think that's from SMS ep. 105, when Artemis and 
Luna get in a fight and the camera zooms in really 
close on Luna's paw just as she's about to slap 
Artemis.  It's not all black, you can see cat 
hairs there.  (No, wait, that's my 
fingerprint-dusted computer screen.)  OK, so maybe 
that was ep. 22 when Rei got mad at Usagi and you 
see a close up of Usagi's left nostril as she's 
making a SD face.

Either way, I would expect that cel to go at least 
$175 on eBay.

Or maybe I just need to shut up now.