Behold! The 'Chestnuts Roasting on an Open Fire' Technique
Deta! Hissatsu Tenshin Amaguriken
"Ever since Shampoo's great-grandmother struck Ranma's Full-Body Cat Tongue point, Ranma is unable to change back into a man! And now, she challenges Ranma to master the Chestnuts Roasting on an Open Fire technique. " (source)