Question

What happens once in a lifetime, twice in a moment, but never in one hundred years?

Answer 1

The letter 'M'

Step-by-step explanation:

if you look at the words 'Minute' and 'Moment', they both start with an 'M' :)

Answer 2

if the question is a riddle the I think the answer is the letter "m"

Step-by-step explanation: