Sometimes, when something bad happens to you out of nowhere, there's a split second where you fully comprehend what's about to go down. Like the instant before the chair you're leaning back on falls over. Like that moment between your tire blowing out and you losing complete control of your car. There's no doubt that that's what this woman is feeling in this split second, right before she topples backwards into the pool.
There is, however, two funny things that pop out of this picture. The first is that while she obviously knows in her heart the drenching she's about to receive, she's still trying to carry on the conversation as if nothing is happening. The second is the guy who's actually posing for this chance photograph. He has literally no clue what he's about to miss.