No, I haven't witnessed that one.. I did see goldfish chasing each other in the pond many years ago and it resulted in baby goldfish... but i never stopped to witness the act itself :P
I have watched, second by second, cat's mating.. I have an American stud cat and his breeder's wish was a) for me to have him and b) if I could I was to use him to provide a valuable outcross for Brit cats... It was all too stressful, (or is the word interesting) for me so I had him neutered after his first successful mating... But I did get to watch a lot of unsuccessful matings lol
