crawling bat

"When you make the most foolish decisions in a situation, especially when the correct decision was easily determinable."

-You have an important exam the next day, and you know you need a good night's sleep to perform well. However, you decide to stay up all night watching TV and playing video games, even though you know it's the stupidest thing to do given the circumstances. You are a crawling bat for doing so.

-You're on a diet and have been making progress. You're at a party and faced with a table full of unhealthy snacks. Despite knowing you should stick to your diet, you indulge excessively in unhealthy food, which is the stupidest thing you could do given your goal to stay healthy.