I thought the phrase "At one's disposal" meant you should dispose of the person or thing.
A childhood belief about speaking

others believed things like this
- i used to believe that a monster lived in the garbage disposal. i would never go near the sink— Whitney
- I thought that a person's motorskills meant how good they were at driving!Anon
- I thought that exorcise and exercise both meant the same thing— Dobby Bob
- I thought “guerrilla tactics” meant fighting like a gorilla— beating your chest and that sort of thing.— Kai
- I thought for the longest time that a No Standing traffic sign meant no person should stand near that sign.— Shannon
- i thought that the phrase "jet lag" was actually "jet leg" until i was 17...— truffles