“Parkinson’s disease” has nothing to do with “parking,” but there are jokes. “Parking-sons Disease  Forgetting where you’ve parked your car” was entered in the Urban Dictionary on January 16, 2009. “Parking Son’s Disease #MiswordedDiagnosis” was posted on Twitter by BASEBALL SEASON YET? on November 21, 2016.
 
This joke was posted on Reddit—Dadjokes on April 30, 2018:
   
“I feel like such a failure, doc. All my 5 boys want to be valets when they grow up.”
Doctor: WOW! That’s the worst case of parking son’s disease I’ve ever seen.
 
This joke was posted on Reddit—Jokes on June 6, 2018:
 
Man: Doctor, all five of my boys want to be valets when they grow up!
Doctor: Wow! That’s the worst case of parking son’s disease that I have ever seen.
   
       
Wikipedia: Parkinson’s disease
Parkinson’s disease (PD) is a long-term degenerative disorder of the central nervous system that mainly affects the motor system. As the disease worsens, non-motor symptoms become more common. The symptoms usually emerge slowly. Early in the disease, the most obvious symptoms are shaking, rigidity, slowness of movement, and difficulty with walking. Thinking and behavioral problems may also occur. Dementia becomes common in the advanced stages of the disease. Depression and anxiety are also common, occurring in more than a third of people with PD. Other symptoms include sensory, sleep, and emotional problems. The main motor symptoms are collectively called “parkinsonism”, or a “parkinsonian syndrome”.
   
Urban Dictionary
Parking-sons Disease
Forgetting where you’ve parked your car.
Dude, where’s my car? Sorry Parking-sons disease. We’re gonna have to freeze our asses til we find the car.
#forgetting#forget#stoned#old#confused
by Topdog Mr.Francisco January 16, 2009
   
Twitter
Jeff Bob
@thebobspot
Honk - a fantastic app for people with ‘parking-sons’ disease http://fb.me/A36031Ey
2:15 PM - 29 Apr 2011
   
Twitter
BASEBALL SEASON YET?
@luvu82brewcrew
Parking Son’s Disease #MiswordedDiagnosis
11:39 PM - 21 Nov 2016
   
Reddit—Dadjokes
Posted by u/porichoygupto April 30, 2018
“I feel like such a failure, doc. All my 5 boys want to be valets when they grow up.”
Doctor: WOW! That’s the worst case of parking son’s disease I’ve ever seen.
 
Reddit—Jokes
Posted by u/porichoygupto June 6, 2018
Man: Doctor, all five of my boys want to be valets when they grow up!
Doctor: Wow! That’s the worst case of parking son’s disease that I have ever seen.
 
Twitter
Luke Lottinville
@lulott
Man: Doctor, all five of my boys want to be valets when they grow up!
Doctor: Wow! That’s the worst case of parking sons disease I have ever seen!
5:06 PM - 6 Jun 2018
   
Twitter
Dad Jokes
@Dadsaysjokes
Man: Doctor, all five of my boys want to be valets when they grow up!
Doctor: Wow! That’s the worse case of Parking Son’s disease I have ever seen.
3:11 PM - 19 Jan 2019
       
Reddit—3amjokes
Posted by u/porichoygupto April 19, 2019
Silver2
“Doc, all 5 of my boys want to be valets when they grow up!”
Doctor: Wow! That’s the worst case of parking son’s disease I’ve ever seen.
 
Reddit—Jokes
Posted by u/Bakedschwarzenbach May 29, 2019
So I said to my doctor, “Doc, I asked all three of my boys what they wanted to be when they grew up, and they said they wanted to be valets!”
And the Doc replies, “Wow, that’s the worst case of Parking Sons disease I’ve ever seen!”
 
Reddit—3amjokes
Posted by u/porichoygupto July 3, 2019
“Doc, all five of my kids want to be valets when they grow up!”
Doctor: WOW! That’s the worst case of parking sons disease I’ve ever seen.