LISP

It's a slow shit interpreted language, doesn't have libraries, you have only recursion and stack overflow, doesn't have an {b.u.i.o ENTERPRISE-GRADE OBJECT-ORIENTED SYSTEM}, you can do just fact an fibs.
Why do you use it?

Lisp was implemented by Steve Russell, he figured out how to make Lisp run in a interpreter loop. If it wasnt for Steve, Lisp would have probably ended up looking like ML or Haskell. Many of the features of Lisp like the VM (interpreter), garbage collection and dynamic typing have made an obvious impact on modern programming languages.