When I play with family/friends, I turn absolutely insane HU. Normally, I am a standard tight player, but once it goes to heads up, I start playing any 2 really strong and become insta-LAgg. The key is that I rarely go all in without the goods. My friend who recently played HU matches with me overused all in bets. He forgot to realize that the only hands that would call his all in would be those that beat him (in most cases)