100 Ideas: Memorise this
This is idea No. 13 in the book!
You need a minimum of a three-slide presentation for this. Slide one shows the things you want students to try to remember; slide two is just a black screen with a countdown timer in the centre; slide three has space for each item to be written on or revealed as and when students are able to recall them.
A downloadable resource is available here to help you deliver this activity in your classroom.