ובכל דגי הים בידכם נתנו (נח ט:ב)

When the Frierdiga Rav zt”l vacationed in Marienbad, he stayed at Mr Leitner’s hotel. Mr Leitner devoted himself to Maran’s needs with extreme dedication.  He once noticed that the Frierdige Rav ate the fish without a fork and asked why the Rebbe wasn’t using the cutlery that he himself toiveled (immersed in a mikvah to render them kosher). 

Maran replied smiling: “You toiveled the cutlery a while ago, but my hands I toiveled today!”