I almost always eat something which has past the best by or expired date. Most of the time it's items like Peanut Butter, canned tuna but, lately, I've used dry yeast that expired in 2004, it was fine. Always eggs, cream cheese that had best by about a month ago and a couple of weeks ago Nyquil that expired in 2011 all with no issues at all. Oh, and that's not to mention when I was in the military, I ate C-Rations that were about 40 years old, and am living to tell about it.
How about you what food items do you eat that have best by or expired dates that have long past.