A: Shows why you shouldn't pass out drunk when your friends have magic markers lying around.
B. "OMG grandma, I told you not to use the discount tattoo place!"
C. Is the latest innovation from Apple, the iBrain. The flash drive is planted right under your skin, and connects in your gums via Bluetooth.
D. Is from an ad for a new type of brain scan.
The correct answer is D. Really!