My Superpower

I have a superpower, do you? Mine is invisibility but it only works when I'm pushing the pram around the shops. It's quite an amazing power really, touch the pram and try to push it and it's as if no one can see you all of a sudden!!
Actually, there are two types of people who my power doesn't seem to work on. Other mothers with prams (we have a harder time trying not to bump into each other) and anyone resembling a granny. What's your superpower?