Split into groups (approx. 10 people) and have each group do the memory verse in a different music genre (eg. Advertising jingle, high school musical, rap, soap opera TV theme song, Opera, Country and Western etc). Record the songs if you have the technology and use them in the coming weeks to remember the verse.
50+ Note: If you have 50 people or more, just use a memory verse song already written (eg. Colin Buchanan) to teach the memory verse. You can play the song on CD and sing along or play it live! (playing live might be best, because the CD can be a bit lame).