Bravery in youth

Marty and Frank were ever so suspicious of the new cat toy, battery operated which makes a stick swing round under a cloth at speed, they must have sat for around an hour watching, Marty much braver than Frank, although that didn't take much, Frank had already decided it would be much safer to watch with his feet firmly placed on the ground behind the stuffed cat, which incidentally is  a doorstop.!

In fact only when Natasha ( AKA Grotbag )( 8 weeks old )  decided to pounce on it, did Marty then get brave and move closer....to Natasha that is  ;)