Most embarassing childhood memory?

When I was about 5 or 6 years old, my family went for a walk. My cruel older sister (who when I was even younger I whacked with a metal toy firetruck upside her head for absolutely no reason) saw some bird poop on the ground. She happily points it out to me (out of earshot of my parents) and tells me...

 Spoiler

that it is vanilla icecream...I am 3 seconds from licking it before my parents start shouting at me and pulling me away. I got pissed (like screaming pissed) until they were finally able to convince me that it was bird poop.