How to make Vibrating USB flashdrive prank!

This is a really cool prank and it's not very hard to make.
You just give it to your friend, he sticks it into his computer and he'll be like: WTF?!
You'll need: 
-a male USB connector (just cut it off)
-an empty flashdrive housing
-a vibration motor from a phone 
-a knife
-scissors
-soldering iron and solder (optional but recommended)

Note: the motor gets hot, probably because the voltage is too high, but your "victim" will remove it immediately so that's not a problem. 

Step 1Disassemble your connector

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just cut off the plastic so the USB connector fits into the case until you get what's on image 3.

Step 2Soldering

Connect the motor to the USB connector.
You have to connect the motor wires to the first and the last usb thing (sorry I don't know how you call that)

Step 3Put it in the housing :)

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My housing was too small for the motor to fit in, so find something that fits :)
Then just place it in the USB flashdrive and close it, have fun!