A simple, small telephone made out of old components.
I saw this video by Electroboom:
I thought his idea was pretty cool but could be modified into a full telephone with a hook switch.
|Full Bridge Rectifier||ATX Power Supply|
|Diodes||Desoldered from PCB|
|Audio Jack||Broken LCD TV I bought from Vetco Electronics for $1.00|
|Switch||Vetco Electronics grab bag.|