If you're anything like me, you can open your fridge and immediately find several condiments you haven't used in months... maybe even years. I know we have a bottle of soy sauce lurking in ours that's probably from, oh, 2007. According to the Table of Condiments That Periodically Go Bad, that Kikkoman needs to be tossed immediately. Cheez Wiz, however, has an indefinite shelf life. Scary. If you're wondering about some of your condiments, check it out - it has a total of 75, so the odds are pretty good that you'll find your answer.
http://backtable.org/~blade/fnord/condiments.html
Maraschino's N/A, ha, they always seem to be lurking in the back of refrigerators.
Speaking of things going bad. Have any oldsters noticed how milk doesn't curdle nearly like it used to? That is a GOOD thing. Nothing worse than lumpy milk. gggg
They aren't condiments but potato chips usually last forever. They go stale but I imagine when something is coated in salt it lasts a long time.
Oh yeah, I really enjoyed all the comments. We have some smart people here!
Brian, I used to always use the Kraft Parmesan until I got a container of their Parmesan & Romano by mistake. I loved it and now it's what I always get. I highly recommend you give it a try.