A meal gone awry

I just had some yogurt, normally a marvelously happy breakfast. Aside from it being really healthy, it also brings back lots of memories for me. Memories of my Mom and I on Wayne's campus; me riding along while she and my dad work out transportation, childcare, work/school. It was great, and every time I eat yogurt I think of that....

Except today. Memories tapping at my psyche, I took the first bite. Yummmmm...and then it hits me. This nasty, chemical-y, uber-plastic sweet aftertaste. It consumed and, in turn, ruined my entire yogurt ritual. Incredibly frustrating.

So my question to all you smart people is: What is that shit and why does it taste so fucking bad? The same question applies for aspertame.