On a not very crowded spanish airport (to be honest, one plane and one controller on the whole airspace). A local carrier plane slowly begins to taxi.
ATC: "xxx, ready to copy?
XXX: "Affirm, go ahead!"
ATC: "Okay, copy a hundred times "I will not taxi without being instructed to do so"
...
...
XXX: "Sorry Sir. We forgot you were there
"
.