i posted this in my blog too but this is great.
i know next to rubbish about electronics but this video was amazing.
[YOUTUBE="l2vvsexdguQ"]Analyzing and messing with a headlamp[/YOUTUBE]
i've always really enjoyed electronics design, micro-architecture. i found that out taking apart my old laptops to change the fluorescent screen tubes and taking apart my cell phones to replace cables. if you find the right supplier you can buy a part for $1 with $5 shipping straight from Hong Kong and fix things.