I worked with one for best part of twenty years. Every August we'd go through the same ritual:
Me: "How d'you think you'll do this season Kev?"
Him: "We'll win the fucking lot mate, League, FA Cup, League Cup and (it goes without saying) European Cup"
Roll on May and I'd say "So, won nowt again then" to which he'd look slightly bemused and say "Won nowt? We won 4th place mate"
No amount of telling him would convince him differently. That said, deluded or not, he was a good lad and I well remember the afternoon of Hillsborough, where he would have been but for work, as we listened to it unfold on the radio. Lots of his mates were there and all came home safely fortunately, not that anybody knew that at the time and it was a difficult afternoon.