Jenny Slate is so into her Marcel the Shell character that she's started slipping into his tiny little voice during her everyday life, and occasionally sings cover songs as Marcel just for shiggles. On Conan last night, she busted out a particularly good one: Fleetwood Mac's "Landslide."

Comedian Jenny Slate has brought back her most famous character, the adorably earnest little Marcel the Shell (With Shoes On) for a surprise third installment of his YouTube series. Slate's also-very-funny husband, Dean Fleischer-Camp, returns as Marcel's unseen, but very understanding interviewer.

Marcel the Shell with Shoes On director Dean Fleischer-Camp razzes his buddies by pretending to take their photo when he's actually filming them instead.

If this timid-yet-adorable talking shell voiced by Saturday Night Live's Jenny Slate doesn't make you crack a smile, your heart may be made of stone. The comedienne used her real voice and co-wrote the short as well.