Yeah, I'm guilty of the brackets too. Sometimes I forget to put the 'then' in 'if then' statements and on one occasion forgot the 'if', I feel incredibly stupid because it took me forever to work out that it was what was causing my problems. Because I was using arrays the syntax highlighter just mentioned the arrays, so I sat there trying to figure out why some perfectly decent arrays weren't working.
Also forgetting to adjust my array counts, so I can sit there wondering for a few minutes why my arrays aren't working.
"Why isn't Array(12) working? Oh wait, there's only Dim Array(11) there."
However, I do tend to remember to dim my arrays before using them, so at least I'm not guilty of that.