Actually, wait, she changed her mind and now says we can get a third cat, but only if we keep it outdoors. Anyway, our current cats are Norwegian forest cats so don't usually vote in American elections.
I don’t think you have a choice in how many cats you own; you’ll wake up one day and they’ll be another one
Lose a wife, gain a mountain lion taking up the same spot in your bed. Imagine how cool it'd be to cuddle with a mountain lion.
Cut ties, change your name, move to a different country, get reconstructive plastic surgery, convert to a different religion, learn a new language, go back to college, etc etc
Get a third cat but don't tell her, but the cat neds to be same as previous two. She won't notice initially, and when she will, she will doubt her own eyes, then you tell her you always had three cats, what's she's even talking about?