Blood donor blitz

Blood donation followed by alcohol consumption. With less blood to dilute the alcohol in your system, it becomes easier to feel the effects of alcohol.

You: "My alcohol tolerance is so high, I've got to drink so much to feel anything nowadays."

Friend: "Why don't you go on a blood donor blitz?"

You: "Wowzers, that idea makes me equally excited and fearful for my personal health! I could feel good about giving blood to someone in need while I feel good about getting wasted on like 2 shots."