In a Star wars RPG I was a bothan scoundrel, scoundrels in this particular system got a few rerolls per day due to their ability 'Lucky'. After several massively botched rolls for falling down a very large crevasse (failed the initial reflex, failed another reflex to grab a handhold, failed an attack roll with a grappling spike launcher) I was halfway through creating another character when I realised the scoundrel still had three uses of his 'Lucky' Ability which could have been used on any or all of those rolls.