When someone believes that they hear the Mr Whippy ice cream van music, but it is just imagined.
"Do you hear that? It's Mr Whippy and his music!"
"There's nothing there!"
"Oh darn it must have been a Phantom Whippy."
When someone believes that they hear the Mr Whippy Music from his Icecream Van, but in fact, they are imagining it.
"Do you hear that? Thats Mr Whippy music!"
"I don't hear anything."
"Oh Darn it must have been a phantom whippy."