What are you thinking

[trailertam]

Who replied to the question " What are you thinking" with "How much the sea errodes the seashore at Mablethorp"

I think it may have been on a television programme

Thanks

[CubicEyes]

Think this was an advert for something; it showed a couple apparently getting romantic on the beach, gazing dreamily into each other's eyes. Then the girl asks her man what he's thinking, expecting words of undying love... and gets that as his reply. Was it WKD or some similarly bloke-ish product maybe?