Won, two, three
In an elementary level class, we were talking about the Olympics and a student formed a sentence that said, "The teams wons medals." Realizing that he might not know that the word won (which is actually the past simple tense of the verb "to win") was the same in singular and plural, I said to him, "What is the plural form of "won"?" He replied "Two." The entire class, including me, burst into laughter.
I couldn't argue with him.