This dastardly little prank will have your victim screaming (or yelling) all night. I'm not a big prankster but this one is just plain fun.

I found this in More Electronic Gadgets for the Evil Genius by Bob Iannini It was called the Mind Mangler. Just thought I'd credit such a great guy.

Here is a video:

So, let's get started.

Step 1: Without Further Ado: the Materials

You will need:

2 555 Timers
1 100K Resistor
1 1K resistor
1 4.7K Resistor
1 100 uF Capacitor (I used 33 for an awesome result...you should get some others in the range for your favored result)
2 0.01 uF Capacitors
1 0.47 uF Capacitor
1 1uF Capacitor
1 Photocell/Photoresistor (A phototransistor will work as well)
1 9 volt Battery Clip
1 Piezo Transducer (I don't know what to say...I found mine on accident. Try a few to get a favored result.)
1 Audio Transformer( I got mine here)
A few sockets if you like to socket parts such as photocells, transducers, resistors and capacitors.
1 Perf Board/ Breadboard

Step 2: The Build.

Once all your parts are collected, build the circuit according to the schematic. I only have a few pictures of my build because you should come up with your own creative design. Post your pictures in the comments. If time permits, I will design a circuit board for you guys.

Step 3: And Now...You're Done.

The Trouble Maker is now done. Hide it in some sort of enclosure and it wait to see your victim in the morning...

It should give them quite a rough night although it won't be TOO long until they find it...I think...