Dame Judi Dench was the biggest prankster on the set of ‘Belfast’. The 87-year-old actress starred in the coming-of-age drama film alongside 11-year-old Jude Hill, and he’s revealed that Judi loved playing pranks on the set. Speaking about the fun they had together on set, Jude told ‘E! Live from the Red Carpet’: “Well, there was a lot of whoopee cushions. That’s what I’m gonna say. There was a lot of whoopee cushions during scenes. “By the end of [filming], if someone sat down on a whoopee cushion, we all just turned heads to Judi Dench.” Jude plays Judi’s grandson in ‘Belfast’. And the young…