This is a NFB short film call Under the Weather by Tali. This animated short follows a group of happy vacationers sunbathing... under cloudy skies. Despite the weather, they look cheerful, eating ice cream and hot dogs, frolicking in the sand. When the sun finally breaks through the clouds, everyone deserts the beach. The film presents a fanciful yet awkward scenario in which the strange behaviour of one person may be the delight of another.
I don't own this film! Tali or NFB owns it.