What language can a junior programmer implement an interpreter for it?

Question

My college is going to start soon, but I want to do something in the remaining weeks :)

I've taken a course last semester about programming languages and I want to bring my knowledge into reality. What simple, elegant language can a junior programmer implement an interpreter for?

I don't mind if the language is very small or experimental.

Answer 1

assembly

I'm not talking about compiling it to machine code. Just an interpreter.

We did it in first year, but the prof wrote the virtual machine, but you can still write it on your own.

Answer 2

Lisp and/or Scheme. For pointers, read the code of IronLisp developed by Leppie.