When I was in grade 4, I did a fitness class thing. One lesson I was really puffed out without really looking up I saw someone wearing the same t-shirt that my dad normally wears. I immediately ran up to him and hugged him. then I looked up and realized it wasn't my dad, it was a random man. I was so embarrassed and flustered. I mumbled a quick sorry and ran over to my actual dad that was standing over in a corner watching the whole thing.
I am still so embarrassed about it to this day.