MIT Scheme, Common Lisp, SML, Haskell, Erlang.
Scheme - it's so concise, clean, Wow!
CL - LOOPing macros, SETF, OOP is just a bunch of slots and macros. Wow!
SML, Haskell - static typing done right. Wow!
Erlang - Wow!
Scala - concepts from SML + design choices from Erlang.
Java, JavaScript - Packers, packers everywhere...