Your schema about what to expect to see at the pool is being violated by the woman in the business suit.
Step-by-step explanation:
When I visited a community swimming pool, I saw the children jumping off the high-dive, two lifeguards, a woman swimming in a business suit, and an inflatable plastic ring. I thought of enjoying in the pool but I spent longer time looking at the woman swimming in the business suit in the pool. The plan that I made to see at the pool was violated by the woman in the business suit.
Sometimes it may due to distraction. Lack of focus in what I want to enjoy made this to happen. Distraction happens, when we let our thoughts to control our action.