Have a good old fun-time improvising I say. There's a cheeky sense of fun to be had in taking a well known [respected] melody; and then transforming it in all kinds of ways! Just on a whim! After academic reading from music page let go your senses, and enjoy it [for the hell of it!] There's three tunes in my concoction here; Welsh, Scottish, and more stately and measured God save Queen/ King [all time favourite]!
You don't need to be intoxicated by anything but a sense of pure fun, dare, and letting go at the moment. You don't need to raise a good flagon of beer just a smile would do instead!