One of the things I am doing for Halloween involves a pumpkin, a proximity sensor, and a music shield.  Unsuspecting suspect comes near pumpkin, and the pumpkin talks to them.  This is a very simple item, but one that can be pretty fun and very useful.

The Arduino is below.  This is based on an Uno and uses a music shield and a proximity sensor.  The music shield is from Seeed Studio and is the most expensive part (save the Arduino itself).  The proximity sensor is a Sharp sensor, which can be bought from several sources.  One potential addition may be a small op amp as an audio amplifier.

This is an Arduino Uno with a music shield and a proximity sensor.

The code is on Github.

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