Yes. I'm not that worried about some foods. I simply do the smell and taste test. Sometimes a food stays fine for a while depending on many factors, including storage conditions, avoidance of contamination, whether the packaging is open or not, level of pasteurization (if applicable) or preservatives, and the type of food. Often the expiration dates are earlier than need be because the producer wants you to use them quickly or toss in order for you to buy more ($$$$$) or to cover their butts if a consumer DOES get sick from it.

Sell by dates are mostly a guide for stores more than consumers. There is a minimum recommended time period between sale and use. Note that after time, some foods do deteriorate, but aren't necessarily dangerous to eat. For example, tortilla chips may go from crisp to stale (making them less appetizing), but eating them won't hurt you.

It's not a goofy topic at all. It's food science (and specifically Food Safety) and a topic frequently discussed on the Reddit.com Cooking forum, where I'm a regular member.