So basically what happened was one day Maria sleeps over, and the next morning (naturally) decides to have a shower. About 20 minutes in, the hot water runs out. Maria, at that time living in an apartment building, has never experienced this. I explain to her the idea of living in a house, and the hot water heater, and how there's only so much until we run out of hot water. Maria's not sure if it's the house or me who's retarded, but this was the result.
Maria's funny like that.