Erlang has a few syntactic conventions that will probably seem familiar only if you've used Prolog. But, like any other language syntax, you learn it pretty quickly and within itself it starts to makes sense.
This was actually the biggest syntactic stumbling block for me, but because I know Prolog. It's definitely not Prolog semantically, and differs syntactically as well (e.g. clauses are separated by "." in Prolog but ";" in Erlang); to this day I sometimes find myself writing Prolog in Erlang.
