Random noise of door slamming

Every now and then my computer makes a noise somewhat like a door slamming (although somewhat softer). I guess it is some kind of notification, but I can't figure out what. It's not mail. It's not calendar.
Any ideas as to what this is or how I can find out what it is?
Thanks!
DanK

Thanks for following up.
I have AIM listed (at the bottom of the column with the names). However I think ttat the names I have listed (there are 6 listed) are all people with iPhones who I have been texting with.

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