A turnip shaped like a thingey

From Blackadder, as an explanation of my thingylamp blog:

Percy: …we came across a turnip that was exactly the same shape…as a thingy!

Edmund: …a “thingy.”

Baldrick: …a great big thingy! It was terrific.

Edmund: Size is no guarantee of quality, Baldrick. Most horses are very well endowed, but that does not necessarily make them sensitive lovers.

Baldrick: I found it particularly ironic, my lord, because I’ve got a thingy that’s shaped like a turnip!