My happy thought (And bear with me on this for a bit) is getting married and trying to have a baby with my wife, but for whatever reason, it doesn't take immediately. We try everything, but nothing seems to work for us, and finally, after two years or so, some miracle happens and she gets pregnant. Nine months later, she gives birth to a healthy baby boy.
We then proceed to raise him speaking in nothing but British accents until he's about five, when his speech patterns would have been fully imprinted in him, then we can go back to our regular voices and raise a kid who speaks British, because really, can you name me anything that would be cooler than that?