In “Building a Bar-B-Q” (S6;E24 of “I Love Lucy”) Lucy thinks she’s lost her wedding ring in a Bar-B-Q, so she spends all night looking through wet cement!

In “Lucy’s Contact Lenses” (S3;E10 of “The Lucy Show”)

Lucy thinks she’s lost her contact lens in a cake batter, so she spends all night looking through chocolate cakes!