To keep with spirit of the season I made this USB-Powered Apple. It is really quite a simple device. It vibrates when a person grabs for it and does not vibrate when a person does not. Unlike your family, this apple is predictable and may relieve stress.
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Signing UpStep 1: Go get stuff
1 - Apple (real or otherwise)
1 - Vibrating motor (preferably 1" diameter... DIY vibrating motor)
1 - 1+1/4" diameter PVC pipe (or to fit your motor)
1 - Water bottle cap (should your motor not fit snug inside the pipe)
1 - Copper foil (the thinnest sheet of copper you can find)
1 - USB cable
1 - QT113H capacitance sensor chip
1 - 8 pin socket (optional)
1 - 0.047uF polyester film capacitor
1 - 2222 transistor
1 - 1N4004 diode
1 - PC Board Grid-Style (Radioshack 276-150)
1 - 5" shielded wire
1 - red and black 22 AWG wire
1 - Electrical tape
tools:
- Soldering iron
- Exacto knife
- Pocket knife
- Hot glue gun
- Drill or awl
- Needle nose pliers















































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The USB port puts out about as much current as 3 AA batteries in series... I wouldn't worry too much about it.
When I made Tazer Tag (http://a.parsons.edu/~randy/tag), people were getting shocked by 80 - 120 volts at around 10mA. I couldn't ever recommend doing such a thing to yourself or others.
In short, I would venture to say that anything that is both under 800mA and 12v is nothing to worry about.