I don't stutter. A friend who does once set me this challenge. It's the first and only moment I've been really able to imagine how it feels, even for an instant. Because, like your wife, the challenge seemed like it wouldn't be too hard when I thought about it in advance, but when I actually tried to do it - even in private - the embarrassment was crippling and I just couldn't manage it. So I guess this is a really good challenge to set for anyone who doesn't understand but cares about you enough to want to try.