Source: http://www.cogsci.uiuc.edu/~laser/scrabble.html

The Top Ten Reasons Why Linguists
Are a Pain to Play Scrabble With:

10. They think of their own native speaker intuitions as a higher authority than the dictionary.

9. They argue about whether they should be spelling phonological words, or syntactic words.

8. They know that anyone can coin a word, and so they do.

7. They try to claim a separate score for every reading of an ambiguous word.

6. They try to claim credit for spelling CV-skeleta.

5. They think it is OK to play proper names, since there is a productive zero-derivation converting them to common nouns. (Semantics: lambda-x[x=alpha], for proper name alpha.)

4. They use boustrophedon writing to cover the scoring squares.

3. They won't let you count the extrametrical part of a word.

2. They keep trying to spell empty categories.

1. "Move alpha" makes it too easy to get to a triple word square.