Let's have lunch - Good bye
Yes dear - No dear
No that dress doesn't make you look fat - It may or may not but I'm not going to tell you
That's interesting - an automatic response to anything really isn't interesting
That sermon was nice - Congratulations. You didn't put me to sleep today
Anything said by a salesperson - I really need this sale
What about you? Any euphemisms that come to mind. Together we might get rid of this insidious disease and start saying what we mean. We might destroy a few marriages or cities on our way but what a small price to pay for plain language.