Supposedly an easter egg in Microsoft Word 97
. Select this phrase and hit thesaurus, and you get back "Unable to have an erection".
A closer look will show that it's NOT an easter egg! If you actually look at the thesaurus window, you'll notice that the item was not found -- so it looks for the alphabetically closest phrase.
Typing "unable to xxx" where xxx is any word starting with the letter 'd' through 'h' and doing the lookup will return the same result.