"Up yours" joke

A man was badly constipated, and had been for several weeks, so he went to
a doctor to try to alleviate his problem. The doctor prescribed suppositories,
and told the man to take one once every four hours. The man left the doctor,
happy that his problem would soon be gone.
When he got home, he quickly took a suppository, swallowing it down with a
glass of water. After four hours, nothing happened, but he figured that these
things take time, so he swallowed another one down, hoping that he would
reap the benefits very soon. After several days, he was still constipated,
so he returned to the doctor.
When he explained that he took one every four hours, as prescribed, the doctor
exclaimed:
"What the hell are you doing? Swallowing them?"
The man replied, sarcastically:
"NO, I'M SHOVING THEM UP MY ASS!!!"