Task: Question Answering
Input (English): Context: Lots of subtlety happening ( like how many people caught that the Joker knows who Batman really is ) . I 'll probably end up asking for the DVD for Xmas . Then we had dinner at Red Robin . I 'll leave it at I only tipped 10 % . That 's rare for me . So that left today to make up for all my avoiding work . 
Question: What may be the reason for leaving that amount for a tip ?
Output (English): Bad service .