You should forget the past and look ahead.

Order of the Phoenix featured Harry and Snape (a powerslash pairing par excellence) forced to become uncomfortably intimate with each other: Snape is teaching Harry how to prevent Voldemort from reading his thoughts by...reading Harry's thoughts; […]

Uladislaus the Second, King of Poland, and Peter Dunnius, Earl of Shrine[…]had been hunting late, and were enforced to lodge in a poor cottage.

Sometimes, too much foreign material can get caught in the crypts, leading to frequent infections.