Off-topic, but something I learned...
I thought surely you meant the "Duracell Bunny", however the Energizer Bunny does indeed exist, and apparently although it's the later of the two, Energizer successfully registered the battery-powered bunny trademark in the US and Canada[1].
Here in the UK I'd say the Duracell bunny is the first to most peoples' minds.
Yes, yes, it's Friday!