Terminus
If I was a wizard this wouldn't be happening to me
Personal fail: I had the 600-rupee wallet, and I had 547 rupees. I was in Sky City and there was a chest with a purple rupee with a poe next to it. While defeating the poe I inadvertently picked up a blue rupee. When I opened the chest, I was "WHY U NO LET ME WASTE 2 RUPEES?" So 5 minutes later I come back thinking I missed a piece of heart and opened up the same chest. My explosion rivaled that of the fireworks that were just starting.