>comment character

Yes the comment syntax can be infuriating if you're not ready for it.

This might not be true any longer, but a number of years ago when I was still using Tcl,

    # this was a valid comment
    #this was not a valid comment

due to the parser reading "# this" as a comment token followed by its string arguments (I guess it's semantically a noop that takes a string arg) and "#this" which threw an invalid token error.

Coming from C/C++ it drove me nuts.