STORM (or TEMPEST) IN A TEACUP (or TEAPOT), subs. phr. (common).Much ado about nothing: cf. a tide and flood though it be but in a basin of water (BENTLEY, Phalaris, 1699, 399).
1885. Daily Telegraph, 30 Sept. The échauffourée in Southern Bulgaria will prove a mere STORM IN A TEACUP.