If you want a job in the moisturizer industry, the best advice I can give is to apply daily.
Why this joke works
One Instruction Fits Two Different Applications
A job seeker applies by asking to be considered for a position. Someone using moisturizer applies it by spreading it on skin. The sentence begins as career guidance and finishes with wording that could sit on a product label. “Daily” completes both readings: persistent job hunting and a repeated personal-care routine. There is no need to change the word’s pronunciation or spelling, so the advice remains perfectly ordinary until the listener switches which action is being recommended.
A closer look
An Unusually Specific Industry Makes the Advice Work
Replace moisturizer with an unrelated business and the ending becomes plain employment advice. The named product is doing real setup work because application is part of using it. Deliver “the best advice I can give” with mild seriousness, then stop after the routine-sounding instruction. An added line about résumés or skin would settle an ambiguity that is more enjoyable left open.
Fact behind the joke
Moisturizer Describes More Than One Product Form
The American Academy of Dermatology groups lotions, gels, creams, and ointments under moisturizers. These products help increase moisture in skin or limit water loss. A cream is generally thicker and contains more oil than a lotion or gel. “Moisturizer” therefore describes a function across several product forms, rather than one specific texture or package.