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Me too, except with Visual Basic 6. (It's a work thing.) Besides error handling, I think the gnarliest thing I've come across is this: VB has built in file management commands it inherited from GW-BASIC. Built in, in the sense that they're first class statements built into the language. One of these, for renaming files, goes "NAME <old> AS <new>", where old and new can be arbitrarily complex expressions. Name isn't a reserved word, so you can have a variable or subroutine called "name". So consider these three statements:

name (...) as (...)

name (...) = (...)

name (...)

...where (...) represents an arbitrarily complex expression. The first one is a "name as" command, the second is an assignment to an array element, and the third is a procedure call, and you can't tell which until you've fully and accurately parsed the first arbitrarily huge expression.

Also, the following:

name:

In BASIC a colon separates two statements on the same line, and an empty statement is valid, so is this a label or a subroutine call followed by an empty statement?

Edit - just remembered this gem: You can use a "With" block to save having to type the name of an object when referring to its members...

With SomeObject

    MsgBox .Name

End With

...will pop up a dialog showing SomeObject.Name. Now go ahead and tokenize that second line. If you're like me you got three tokens: [MsgBox][.][Name] The problem is that's indistinguishable from...

MsgBox.Name

You could say that ".Name" should be one token. Hmm. So what if it's something like...

MsgBox .Name.Substring(1, 3).ToUpper()

Still one token? I think my hair's going to be white by the time I finish this project.