So I've got this cousin who's a doctor. He and I have been really close ever since we were born. More like brothers than cousins really. Point being that we have a long history of fucking with each other, and that this story should be understood within that context.
Not long after he got his MD, he's in town for a visit. I go in to the room where he is and take my, as you call them, knackers out and say "Hey doctor, I need you to take a look at this."
"Jesus, put those away!" He responds, "Just tell me what's wrong."
"Nothing" I say, "I just wanted to make you look at them."