I suppose all of us at one time or another have managed to install the blade backwards on our tablesaw and wondered why the hell the thing wasn't cutting worth a damn, but I've never had it happen on my bandsaw before. I was uncoiling a 1/4" blade from storage and somehow I managed to get the thing turned inside out, and it never occurred to me to check the direction of the teeth while installing it. Come ON, no blade could possibly be THAT dull!
Be careful out there. :-)