Supermarket trolleys

Supermarket trolleys are not just for Christmas, they're for life!

I'll carry your things if you push me around,
In Morrisons or Tesco, it'll cost you a pound.
Wheel me around; and I'll carry your shopping,
Past the fresh fruit and veg., starting and stopping,
Fill me with cabbages, crisps and cake; and loads of stuff for Christmas!

(Sorry that last line doesn't rhyme)