A blonde went on a tour on an old steam train that took the passengers through mountains and tunnels. As the train approached a tunnel, the conductor hurriedly walked through the coaches warning passengers,

"Tunnel ahead. Look out!" The blonde quickly stuck her head out the window, and her forehead met with the concrete entrance of the tunnel.

After being revived 15 minutes later, the blonde's words were, "That stupid SOB! He should have told me to look IN!"