The players had formed a D&D adventuring group without a single spell caster. After their first disastrous adventure, they advertised in the local bars and taverns for a spell caster. But their reputations prohibited a serious respondent. They finally got contacted by Scooter Pitstick, a half-orc of some small reknown.
Being as he was the only applicant he got the job. Through their early journeys together, it came out that Scooter was on a one year quest - undertaking a vow of stupidity. He was not able to use his intellect to solve any problems, but had to go on instinct instead. He felt that he could best exhibit his disdain for reason by hiring on to the players. He was a reasonable spell caster, but never felt the need to cast spells in front of the players (they always had another way out, he felt). Until they were captured and imprisoned by dark elves.
When he was asked for help, he responded by saying Egg! What the hell? Oh, they figured out that he wanted an Egg (he did not speak common, and none of the players spoke Orc - adding to the hilarity). Once he got the egg, it turned out to be the material component for "stinking cloud", which Scooter used on the guards in order to escape the prison.