"Broke?" joke

I went into the doctors the other day and saw the doctor examining a patient.
the patient said,
'I have a serious problem with my arm, look'
the arm lifted slightly and said,
'give me a tenner'
the arm the lifted halfway and said
'give my 100 quid'
and then the arm lifted as high as it could and it sais
'give me a grand'
The doctoe was still examining and eventually he said
'I'm afraid your arm is broke'