YEAH, RIGHT
Credit: Boston Globe Crossword
Emily Cox and Henry Rathvon (#1-4)

Comments that deservedly elicit the response, YEAH, RIGHT:

1. You don't look any older.
2. We'll get right back to you.
3. This won't hurt a bit.
4. Your secret is safe with me.
5. [Dog owner as his dog is charging at you]: He won't bite - he just wants to play.

NOTE: See also THREE BIG LIES - posted July 8, 2008