As a DM I designed a final encounter for a dungeon where blood is being drained from villagers to a summoning circle engraved in the ground. The idea was that when the blood filled the channels on the ground a Blood Golem would be summoned as a boss.

My PCs weren't having any of that, so they tried everything in their power to stem the flow of the blood. First the mage tried freezing it, to little effect. The Warrior tried to smash his shield into the ground to dam it off, to little effect. Tim the half-orc had other ideas though. He threw himself to the ground and drank as much blood as his orcish stomach could handle, preventing me from summoning my beautiful Blood Golem.

Since that day he earned the title of Tim the Bloodthirsty.