Whats small and gray and you cant's see, but hear it beat?!

Question: Whats small and gray and you cant's see, but hear it beat!?
Answers:

a small grey drum that is invisible!?Www@Enter-QA@Com

The pitter patter of tiny baby elephant feet!?Www@Enter-QA@Com

Hmmm!.!.!.I know this one!.!.!.I know, I know, I know!.!.!.it's your cold, hard heart!.!.!.lol!.!.!.Www@Enter-QA@Com

the worlds smallest violin!!!! lolWww@Enter-QA@Com

musical notes!?
just a guess lolWww@Enter-QA@Com

ur heartWww@Enter-QA@Com

my head hurts from to much thinking!!! can u just tell meWww@Enter-QA@Com

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