I got my hands on some cast-iron city grade payphones.
I curated a collection of ironic '90s, created a directory, and hacked the payphone to play the music either over the handset or as a jukebox.
The phone senses when people walk close to it and starts ringing, inviting them to pick up and listen.
The internet liked this one! Front page of reddit and lots of hype :)
I open sourced the project. Find the step-by-step guide here: https://www.instructables.com/id/90s-Payphone-Boombox-Hack/.
Lots of people were able to follow this Instructable and make thir own. Check this one out.
Some subtle acylic branding on the front.
Speaker on the left, sensor on the right. Drilling through cast-iron, not fun.
Directory of ninety carefully selected ironic '90s tracks.
The ugly front panel. Uses Arduino Mega, Adafruit MP3 shield, rangefinder, rocker switch, 20W amp, 20W speaker. Would be more elegant (and cheaper) to do this with a Teensy in the future.