I am thinking, for the channel 4 logo i might make it
look like a lightbulb, or even flick a switch to lighten it up at the start.
Possilby use a quote such as:
'comedy to brighten up your day'
or
'genious comedy'

Like this! have the plain channel 4 logo then have a switch noise maybe with a drawing of a switch on the design and make the logo light up.. Then make the type appear 'brighten up your day with comedy on 4'