Squeezing blood from the turnip of bad shape
White states, "I think that's bad shape."
Black replies, "Can't be too bad, I mean there are other stones around...."
White says, "Mmm, still looks suspect to me."
Black says (slightly defiantly, but in good fun), "Well, you just try and squeeze blood from that turnip!"
I believe both players learned something about shape that day. -However, I can only truly speak for myself ;)
Classic *Good and Bad Shape
Many examples of exploiting bad shape are more formally recognized as tesuji. Some examples include: