He put in his thumb and pulled out a plum.. I read that the 'plum' was actually the deed to a piece of land. Way back long long ago when people walked everywhere it was often the custom to hide...
He sat in the corner eating a big plum pie, he put in his thumb but instead of a plum he squirted juice in his eye! The rhyme goes Little Jack Horner sat in his corner eating his Christmas pie he put...