Mutant vegetables? Stolen lemon trees? Robot librarians? It’s all happening.
In 1999, radiation spawned mutant tomatoes.
Season 11, Episode 5, "E-I-E-I-D'oh!"
Full mutant vegetable article here.
In 2008, Homer's voting machine changed his vote.
Season 20, Episode 4, "Treehouse of Horror XIX"
Full faulty machine article here.
In 1995, an entire lemon tree was stolen.
Season 6, Episode 24, "Lemon of Troy"
Full lemon theft article here.
In 1995, Lisa's "future" fiancé could verbally communicate with his watch.
Season 6, Episode 19, "Lisa's Wedding"
Full "Smartwatch" segment here.