If you bother a Penny they will just shriek like an angry dial up modem and also probably bite
If you make a Penny very excited they will also shriek like a dial-up modem.
If a Penny feels mischievous, they will lean in close. And shriek like a dial-up modem.
Penny likes to be loud.
@PennyPennyPenny Honestly you could have told me that 'yaya' came from an interpretation of dial-up noises and I would have believed you.