Because the extra bean would be too farty.
Terri-fried!
"Would you like fries with that "
Because it rhymes with Bank Manager
Because if there were one more, it'd be two forty. (Too farty) This works much better when spoken out loud. The joke how Irish people pronounce "forty."
Because one more, and it'd be too farty.
Because one more would have been too farty.
Because 1 more would have been 240...
Because one more would be too farty.