I need an idea to show single replacement reaction and double replacement reaction. The example the teacher used was a single guy + couple dancing - Girl swithes partners. I have to be able to draw the idea....help!!

I still need ideas for science reactions. For example on composition I used a smore. I drew the graham cracker, chocolate and marshmellow; then showed them combined. For decomposition, I drew a sandwich then becoming bread, meat and cheese. I'm stuck on signle replacement reaction and double replacement reaction. Any ideas??? Anyone????