Two children, Johnny and Alex were sitting outside a clinic.
Alex was crying very loudly.
Johnny: Why are you crying?
Alex: I came here for a blood test.
Johnny: So? Are you afraid?
Alex: No. For the blood test, they cut my finger.
After hearing this Johnny started weeping making Alex feel surprised as well as curious and Alex asked:
Why are you crying now?
Johnny: I came for a urine test!