I especially liked it when Nora is shouting at Wally while he has his motorcycle helmet on - he can't hear her. She bonks him on the helmet, he says he thought a slate had come loose! Then Wally admires the on qualities of a good helmet . That might even be the same episode, I can't remember.
Rick Ans, the quote is
Nora - 'And don't put your helmet back on. You can't hear me with your helmet on'
Wally - ' I know. It costs a fortune does a good helmet. They're worth every penny.