Nothing, its impossible!
M!
M!
the letter M
The riddle states that what comes once in a minute, twice in a moment, and never in a thousand years refers to the letter "m." It appears once in the word "minute," twice in the word "moment," and is absent in the phrase "a thousand years." This clever play on words highlights the unique occurrences of the letter "m" in different time-related terms.
The letter "m" :DOnce in a minute, twice in a moment, and never in a thousand years.
M
an m
The letter M
M
The letter 'm' !
M!
The letter M.