Yet another riddle?!

Yet another riddle?

A man in a restaurant complained to the waiter that there was a fly in his cup of coffee. The waiter took the cup away and promised to bring a fresh cup of coffee. He returned a few moments later. The man tasted the coffee and complained that this was his original cup of coffee with the fly removed. He was correct, but how did he know?

9 hours ago
correct but i'm really starting to hate you smart people... but i'll be fair and give you the ten points when i can. (four hours)

he had sugar and creamer in it