Cavechat.org

A blonde was taking a guided tour at a local cave. At a certain point on the tour, all the lights were turned off to illustrate the concept of total darkness.

As this was done, amid the typical oohs and aahs, the blonde exclaimed, "Wow! Can you imagine what this place must be like at night!"

true story:

while guiding a commercial tour we turned the all lights out. We were over 1/2 a mile from the entrance and over 200 ft deep. A lady in a deadpan voice says: "I thought it would be darker than this".....