If you visit a supermarket car park you are likely to see lots of them. You see them when cars pull up and park in “Parent and Child” car parking spaces. The adult(s) jump out of the front of the car. Then you see the children jump out. Well in fact you don’t see the children jump out and you don’t see the rear doors open. Presumably they must be imaginary children if they have parked in the “Parent and Child” spaces!