If someone doesn't behave, they might end up on Santa's naughty list.
Если кто-то плохо себя ведет, он может оказаться в списке непослушных Санты.
Definitions
A 'naughty list' refers to a list of individuals, typically children, who have been deemed to have behaved poorly or misbehaved, often associated with the tradition of Santa Claus during Christmas. Those on the naughty list are believed to receive fewer gifts or no gifts at all.