it's a bird?

walking to work this morning i see a very old man standing on a corner starring at the ground. what he's looking at catches my attention too so i stop and stand with him. it's an egg, cracked open on the ground, and there is a tiny carcass of a tiny chicken in it.
the man looks at me, "what is it?"
and i say, "an egg. and there's a baby chicken inside"
the man gets this look on his face that i will never forget, sadness? confusion? he looks up from the ground again and into my eyes and replies, completely enthralled, completely invested in this moment, completely in disbelief, "it's a bird?!"

random aside: this is the THIRD time i've seen a cracked egg with a bird carcass in it on a random street in ny. what's the deal??