So... I just discovered that there's a bar of soap with BÜCK DICH written on it, which I guess I wouldn't advice to take with you to prison. But the price is
Rammstein - Bück Dich Seife • Rammstein Sammlung von lauraxrammstein
Rammstein Seife „Bück dich“ (rot), OVP, neu in Nordrhein-Westfalen - Mönchengladbach | Badezimmer Ausstattung und Möbel | eBay Kleinanzeigen
Rammstein Seife ”Bück Dich” *rot* | RammsteinShop
RAMMSTEIN SEIFE "BÜCK Dich" NEU & OVP EUR 9,99 - PicClick DE