It was another day to giggle in nutrition class.
The professor was explaining that there is a small amount cyanide (actually cyanogenic glycosides) in certain fruit seeds: apple, peach, apricot, plum.
"But who's going to sit and eat a bowl of apple seeds? There's more of the compound in the peach pit, but you'd have to crack it open with a hammer and then eat the bitter, meaty part of the seed inside. Who's dumb enough to do that? Maybe we just let these people go. If you have a real desire for peach pits, save us all some work and dig a hole in the yard first."