What do the rumours say about Tom Cashman, Bec Melrose and Mark Humphries? | Question Everything

Does Tom Cashman play sax in his dad's cover band? Was Bec Melrose on Family Feud? And has Mark Humphries never seen Grease? #QuestionEverythingAU
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[@banksiasong]

I cannot remember the "Naahaaahaa ..." in Grease which Mark is referring to, does anyone know?