When I have a cold my voice only gets a little bit lower -
But for you it randomly went low...
We did'nt hear your cat impression...it could've been the way you did it - I have a post similar to this somewhere and I'm not sure if my voice is breaking either - I did a weird hi-ii thing on purpose, but it screwed, that could've been my voice breaking or just me doing it wrong you see.
I think your voice could be breaking but I'm not too sure
Just my opinion