My godson's sis, age 3 stood in the entrance hall of a 12thC Oxfordshire house when an old friend from school of her father turned up. He was Nigerian, 6ft 3 and quite portly, therefore filling the entrance of the old house. She looked him up and down and issued the immortal words, "Why are you covered in chocolate?"
To counter this, I was with a limo driver in Washington D.C. and he said that they often had similar reactions from their toddlers - "why is he/she covered in talcum powder?" or "Is he/she a ghost?"