Rhys Millum, an 8-year-old boy from Harrogate (England) died in 2022 after swallowing ten magnetic balls that caused a perforated intestine. The magnetic balls had been a gift that Rhys and his brother had been playing with without problems for a month.

Police investigated the possibility that he may have been participating in a "TikTok piercing challenge," which involved placing magnetic balls on either side of the cheek to mimic a piercing, but found no evidence of this.