A scientist found, to his great surprise, that he was lactose intolerant (unable to digest milk sugar). At dinner that night with his two young daughters (age 9 and 4 years), he mentioned that he had found out that he was lactose intolerant and tried to explain to them what that meant.©OFFICEJOKES.NET

A couple of months later, he took the kids to a local restaurant for a quick breakfast before shopping. The place was very busy, but the quality of the food and service were obviously not up to par.©OFFICEJOKES.NET

When they finally got their breakfast, his youngest daughter took a look at her father's omelet and burnt toast and declared very loudly to the waitress "My Daddy can't eat that toast, he is black toast intolerant."©OFFICEJOKES.NET

Needless to say, after a moment's silence, the whole restaurant burst into laughter.