Martin Pietrucha, loyal malaphor follower, unintentionally uttered this one the other night while talking with his kids. It is a mashup of “sour grapes” (someone is angry or bitter because he has not gotten something that he wants) and “a bitter pill to swallow” (an unwanted situation that someone is forced to accept). “Sour” and “bitter” seem to be the culprits here, both are two of the five basic tastes (sweet, sour, bitter, salty, and umami). Also one swallows grapes as well as pills. A big thanks to Martin for sending this one in.