This project was inspired by a post couple days back on the main site. Add a too large an order of white leds, spare time and parts plus boredom, and this project is the result.
Components
1×
Cheap multimeter
or meter you don't mind opening up
1×
LEDs
of any color
1×
Resistors
for limiting the current for the LEDs
1×
Capacitor
adjust for how long you want the drive the transistor