What does "a bull in a china shop" mean — and why is it funny?

informal

Meaning

A clumsy person who causes damage or chaos in a situation that calls for care and delicacy.

Where it comes from

A British image popular since the 1800s, setting the largest, least careful animal loose among the most fragile goods imaginable.

Why it is funny

The humor is the perfect, doomed mismatch. You picture a huge bull edging down narrow aisles stacked with teacups, and you know exactly how it ends. The phrase makes you wince and laugh at the same time.

Used in a sentence

"He tried to apologise and somehow made it worse — a real bull in a china shop."