Found these at the most unlikely place: http://www.eet.com/op/buzz
Class!
Part 1
An architect, an artist and an engineer were discussing whether it were better to spend time with the wife or a mistress.
The architect said he enjoyed time with his wife, building a solid foundation for an enduring relationship.
The artist said he enjoyed time with his mistress, because of the passion and mystery he found there.
The engineer said, "I like both."
"Both?," the others said.
"Yeah" he said, "If you have a wife and a mistress, they will each assume you are spending time with the other woman, and you can go to the lab and get some work done."
Part 2
To the optimist, the glass is half full.
To the pessimist, the glass is half empty.
To the engineer, the glass is twice as big as it needs to be.
Class!