There's a song my uncle used to sing (sorry, I don't have the tune for it) that was a very simple accumulative song (along the lines of "100 bottles of beer"), that went like this:

An el-e-pant went out to play
out on a spid-er's web, one day.
He had such e-NORM-ous fun,
he in-vit-ed an-oth-er el-e-phant to come.

Two el-e-phants went out to play

Etc. ...

The song would start with my uncle singing, and marching around the room. When he got to "he invited another elephant..." he would reach out and take the hand of another person there, and then the two of them would romp around the room, and it would continue until everyone in the room was part of the chain, which would end up marching through all the rooms on that level of the house...

Mind you, he did this with adults :-)