A few years ago I was walking through the town centre of my home town - so far so normal. That is until you add in:
1) A knight in full armour on horse back walking up the main street.
2) 3 men dressed as Elvis on stilts with mini guitars walking through town singing. Was getting quite freaked out by this as they seemed to be following me everywhere.
Never did find out what the event was... Mind you considering my home town, there wasn't necessarily going to be a reason!