Urusei Yatsura S01 E102 Mendo Family - Summer Christmas

"Grab her horns and she might just become your darling!"

Ryoko holds a "Summer Xmas" party, where everyone must come in male-female pairs. And the main attraction is a gigantic Christmas tree, which they must climb in order to get to the dance floor above. The male winner will receive a kiss from Ryoko, and the female Mendou.