One of my favourite vore scenes ever, from the Cartoon Network show, 'Two Stupid Dogs'.

Little Dog sees a tennis ball flying through the air, and immediately tries to swallow it whole. Triumphantly, he succeeds, not knowing that he's infact swallowed his best friend Big Dog, who was transformed into a tennis ball only moments ago.

Its a shame that Big popped to normal size though. I always wished this moment would last a little longer.