The doorbell can handle up to a 32GB SD card (not included) full of whichever songs or sounds your little heart desires. You can load up a horse neigh, some gangster rap, or “Star Trek” whooshing door noises.

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Best of all, you can set it to play “Never Gonna Give You Up” in order to Rickroll unsuspecting delivery people, family members, neighbors, and solicitors.
via cnet

More here 

Also, see: Rickrolling, Wikipedia (for those of you wondering “Huh?”)

Image: Swann