N'hi ha per llogar-hi cadires

Literally: There's enough to rent out chairs

Example: “La discussió entre els dos veïns era per llogar-hi cadires.” — The argument between the two neighbors was worth the price of admission.

English equivalent: Worth the price of admission

Origin: "There's enough to rent out chairs": a scene so remarkable, or so absurd, that one could charge people for seats to watch it, as at a show. The phrase is everyday Catalan, usually ironic, and no first use is documented.