Date Masamune and the Tea Bowl

Date Masamune was a famous samurai of the sengoku period known as 'The One Eyed Dragon of the North' due to the fact he had lost an eye to smallpox as a child. He gained a fearsome reputation as a calm stoic General and in his wealth developed a passion for collecting tea bowls to use in the tea ceremony. One day a retainer passed him a particularly valuable example and Masamune nearly dropped it, flinching visibly in surprise. The normally stoic warlord was annoyed at this loss of composure and threw the bowl to the floor, shattering it completely.  He glared  at the shards and growled that a true warrior should not become so attached to anything to the extent of losing his composure.
We all develop attachments for people, places or objects and in fencing this can manifest in techniques we get habituated with. This makes you predictable after a while so my question to you as we approach the new year is, what is your tea bowl of attachment?