When a Neighbor Gives You Lemons

I'm going to have to make a whole lot of sweet tea to handle this lemon!
This giant grew in the backyard of a neighbor. When she brought it over and I saw its size, all I could think was that her lemon tree must be kin to the tree from Poltergeist. But, I minded my manners, kept my musings to myself and thanked her for the thoughtful gift.
Shall I save a seed and plant its spawn?