Why do we...?

So I was heating up my lunch yesterday and I wanted to put ketchup and mustard on my bread to make orange bread for my hamburger. I knew I had ketchup and thought I had remembered seeing mustard in the fridge at work. So I went to pick up the mustard... it had expired... in July... of 2003!

Okay gross. Here's the funny part, what did I do with the mustard after seeing it's almost 5 years expired? I put it back in the fridge! I've seen plenty of people do this. I've done it. Do we think it might be okay the next time? Is it too hard to throw in the trash? *laughs hysterically* Who knows but I thought that was funny. I did end up throwing it away by the way.