In This Instance, Content Defeats Style

I'm always chastising my wife for beginning her stories with expository topic sentences:

the funniest thing happened!

you won't believe how annoying!

as these kinds of statements not only destroy the drama of the narrative, but they also set up the audience to be in a contradictory position-- we'll see just how funny this thing is . . . so when the boys and I walked in yesterday and she said, "I saw the craziest thing!" I was not only skeptical, but also annoyed at her anecdotal style, but for once the story actually lived up to the opening; the rain finally let up and so Catherine took the dog for a walk in the park, along the river, and she saw a giant tree floating downstream-- the Raritan is tidal by our house, so sometimes-- when the tide is coming in-- the current runs upstream towards New Brunswick, but most of the time it runs downstream towards Perth Amboy and the Raritan Bay, which leads into the Atlantic Ocean; when she took a good look at this giant floating tree, she noticed a seal perched upon the trunk, a seal which apparently got swept up in the storm current and ended up far from the ocean and was now wisely hitching a ride on a makeshift deciduous raft back to its home, unfortunately she did not have her phone and so there's no proof of this bizarre happening, but I believe her because it's too weird a thing to invent.