The hymnal game with Jenny P before Christmas at the Valley (put the phrase "under the covers" after every song title). Some of the more outstanding:
Leave it There
When our confidence is Shaken
anything having to do with rising, raising, arising, etc.
O Thou who Comes from Above
Jaya Ho (just cause it said ho)
Fill My Cup, O Lord
Trust and Obey
Go Down, Moses
I Need Thee Every Hour
O Come and Dwell in Me
He Touched Me
Come, All of You
He Rose
O Sacred Head, Now Wounded
The First One Ever
O Love, How Deep
That Boy Child of Mary
The Friendly Beasts
What Child is This
Creating God, Your Finger Trace

I don't think the old people in front of us cared for it much.