sandwiches for small people

i worry about small people and how they can’t see things that taller people can. luckily in Heathrow airport the Harrods shop has addressed this by putting signs on the under-side of its normal signs.
the advertising could have been a bit more targeted: “premium sandwiches to make you grow big and tall”.
or even better “kids, why not nag your parents in to buying you some Harrods chocolates” ?