Tick Tick Tick

I was on the phone with my dad last night and I kept hearing a 'beep'.
It was exactly every 5 seconds through the entire conversation.
It sounded like some sort of medical beep... you know, the kind you hear in the hospital.
I asked him about it and he said he could hear it also.
I asked him if it could be his phone battery running out... or anything of the like.
Then it hit me...
"DAD", I said.
"When was the last time you had the battery on your pace maker checked?"
He laughed and said that it was doing fine... The 10 year old battery was supposed to conk out after 7 years and had been checked only 2 weeks earlier.
I was skeptical and told him to go get it checked!!!
The beeping sounded like a warning alarm like it was about to cut off... just like my cell phone!
:)