Any time you feel dumb, don't worry. Check out the following excerpts from a "Wall Street Journal" article by Jim Carlton. Lots of people are dumber than you.
Thomas and Maxim were working for Provinciale Ontwikkelingsmaatschappij Antwerpen (they take care of the roads in Antwerp). One would dig a hole and the other would follow behind and fill the hole in.
A young technician and his general manager board a train headed through the mountains on its way to Wichita. They can find no place to sit except for two seats right across the aisle from a young woman and her grandmother.
Yes, these are (apparently) all true.