Jeepers, it's not an ultimatum, it's fun. Is there no such thing as a wink and a smile in your world?
There's winks and smiles (and BTW that's the first time you've indicated there was even the slightest jest in it, we only know what you tell us here) but that's still an ultimatum, a rose by any other color as they say. A wink and a smile might turn it into a friendly or funny ultimatum, but it's still a "do this or else".