This is a file with (some) parentheses.
In particular, it has (I think (I really do
think) ) not an excessive number of right
parentheses, but rather an unbalanced or
premature one, which should show up now!), 
not waiting until we reach the end of the file...
Here's an extra left parenthesis ( which could
(but shouldn't) balance the earlier right one!
(How's that?)