Watch: Phyllis keeps it to the letter in Barnsleypublished at 10:16 British Summer Time 22 September 2017
Jenny Eells
You know the alphabet, of course, after all you've been reciting it since you were in primary school.
But can you say it backwards, no mistakes...and beat a time of just seven seconds?
Yup. Seven seconds. Give it a go. It's not easy...
One person who's got it down to a "T" (pardon the pun) is 97-year-old Phyllis Knight who lives at Oakwood Grange Care Home in Royston, Barnsley: