According to one laborious workshop scientist, Rob Cruickshank, the resonant frequency of #GooglyEyes has been determined.

A resonant frequency is the frequency of vibration at which an object gets really really excited... like the famous example of an opera singer cracking a wineglass with their voice.

See those excited #GooglyEyes for yourselves - (you might want to lower the volume before you press play, though):

In physics, resonance is a phenomenon in which a vibrating system or external force drives another system to oscillate with greater amplitude at specific frequencies. Frequencies at which the response amplitude is a relative maximum are known as the system's resonant frequencies or resonance frequencies. At resonant frequencies, small periodic driving forces have the ability to produce large amplitude oscillations, due to the storage of vibrational energy. [from wikipedia]