The see-through model of an ESP tele Guitar. The transparent body can hold any form of liquid, which gives a wave effect, hence the name "Wavecaster".
Kirk Hammett, Metallica's lead guitar player, introduced this to audiences back in the Mid 90's and can be seen in the encore set of the Cunning Stunts DVD.
1. "Dude, i can see water inside your telecaster, it almost looks like waves."
"Dude, its a wavecaster"
2. I was going to fill it with my own urine but i thought it might go stale and smell...