sorry to be a wet blanket

cliché Used to introduce or accompany one's opinion or instruction, when one feels that it will ruin or dampen other people's fun, enjoyment, or enthusiasm. Look, I'm sorry to be a wet blanket, but we really can't have the music so loud or the neighbors will complain! I just don't understand the appeal of these brainless, over-the-top action movies that don't make one bit of sense. Sorry to be a wet blanket, but that's just how I feel.