This goes very well with the rhyme, Open Them Shut Them:

Open, shut them
Open, shut them
Give a little clap, clap, clap!
Open, shut them
Open, shut them
Lay them in your lap, lap lap.
Creep them crawl them , creep them crawl them
Right up to your chin, chin chin
Open up your little mouth
But do not let them in!

It is important to remember your audience – do not put items that the children could choke on inside the containers, and remember that string and yarn can be a strangulation hazard (this is probably obvious to many of you, but just in case…)