Last year, Scott got me a certain computer game for my birthday.
My passion for blowing up tiny creatures has not abated since. If anything, it's gotten stronger. I can (and have) beaten both Scott and his 18-year-old brother at this game, so keeping in practice is now a matter of maintaining my reputation.
Playing by myself is good in its own right, of course, and not just as a means of practice. When everything else is difficult and refuses to work out the way it's supposed to, I can win at this game. Usually in less than half an hour.
Also, it's just plain fun.