A rough afternoon

Why is it that after a few weeks of hardly any wind and a lake that has been like glass, that lake turns to a washing machine when you want to share it with visitors.
Friends from Wellington arrived this afternoon and the plan was to spend a few hours cruising around, swimming, fishing and hopefully catching a fish.
We still went out and they loved it, we swam and the water was warm but very choppy, and we tucked into a little corner away from the rough and had a short fish, no luck I am sorry to say.
But it didn't reduce their enjoyment. We take for granted a little bit the beauty of our place and it takes the pure joy of first time visitors for us to remember how lucky we are to live here.