Miranda Sachtschale and Matt Timm, juniors at Kettle Moraine High School in Wales, said they and their friends went to Lac La Belle in Oconomowoc prior to the prom Saturday to take some group photos and they all gathered on a wooden pier, WISN-TV, Milwaukee, reported Wednesday.
"I heard like, one crack, and then the whole thing collapsed from under us," Timm said.
The group said they emerged from the lake and were able to make it to the prom after spending some time with blow dryers.
"We're laughing about it now and it's hilarious, and I'm sure my kids will laugh at it," junior Tom Gensler said. "It'll be remembered a long time."