Why DIdn't Anyone Tell Me?

Occasionally someone serves me a combination of flavors that makes me think "why didn't anyone tell me that you're supposed to eat these together?!" My standard example is good balsamic vinegar on panna cotta (trust me, it's amazing). Tonight, a friend shared with me the knowledge that we've been failing to put hazelnuts on our beets all these years

Have you ever had this reaction? What was the combination?