Laboratory Tests
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 Two children were sitting outside a clinic. One of them
 was crying very loudly.
 
 2nd Child: Why are you crying?
 
 1st Child: I came here for  blood test.
 
 2nd Child: So?  Are you afraid?
 
 1st Child: No.  Not that.  For the blood test, they cut my finger.
 
 At this, the second one started crying. The first one was astonished.
 
 1st Child: Why are you crying now?
 
 2nd Child: I have come for my  urine test!