Two scientists walk into a bar.
"I'll have H2O," says the 1st.
"I'll have H2O, too," says the 2nd.
Bartender gives them water because he is able to distinguish the boundary tones that dictate the grammatical function of homonyms in coda position, as well as pragmatic context.
— Diane Turnshek (@DianeTurnshek) December 8, 2017