Well, it has to be "Sunday Morning", by the Velvet Underground...
Although that's a specific type of sunday morning: a "road trip weekend, drive all day on saturday to get to a party in a distant part of the country, drink the town dry, behave like the men our parents warned us about, pass out, sleep it off, wake up without a hangover (just to piss off everybody) eat a fried breakfast then drive out of town on a quiet sunday morning with the music on too loud to pass as anybody's good neighbour" type of sunday morning.
And then, of course the rest of the album just gets weirder in so many ways... :-)