Cartman uses himself as a bait in this South Park scene. It's the show's homage to Easter.

South Park Season 16 Episode 4 Quotes

Mr. Billings: What are the chances that Jewpacabra is real?
Peters: I'm estimating around .000000001%.
Mr. Billings: I can't afford to take that chance.

You can't scare a Jewpacabra! Don't forget Butters, we're dealing with a creature that drinks blood, hides in the night, and has no belief in the divinity of Christ.