two med students were sitting in a park eating lunch when an elderly man came walking by. the old man had his legs slightly apart and was a bit hunched over while kinda shuffling his feet.
the first student, wanting to show off his medical knowledge said "i can see he has 'Watkins disease' by the way he is walking".
the other med student said "no way, that's parly's disease' if i ever saw it".
the old man comes by and they ask him "excuse us sir, we are both med students and we were wondering what is wrong with you.
Bob here says 'watkins disease'.
the old man says "well you would be wrong".
the other med student says "parlys disease?"
"you would be wrong too."
"well what is wrong?"
"Well,,I thought i had gas but i was wrong too."