“I asked a museum worker if I could take pictures. He said they stay on the walls”

Are museum visitors allowed to take pictures? A joke was posted on Twitter by Bytown Museum on June 16, 2019:
     
“I was at a museum, and I asked a worker there if we were allowed to take pictures. He told me no, as they had to stay on the walls.”
   
The joke was posted on Reddit—Dadjokes on August 4, 2019.
   
   
Twitter
BYTOWN MUSEUM
@BytownMuseum
Here’s a dad joke to celebrate Father’s Day!
I was at a museum, and I asked a worker there if we were allowed to take pictures.
He told me no, as they had to stay on the walls.
#BytownMuseum #DadJokes #FathersDay
Image
10:25 AM · Jun 16, 2019·Twitter Web Client
     
Facebook
Gilcrease Museum
July 1, 2019 ·
I was at a museum and I asked a worker there if we were allowed to take pictures.
He told me no, they had to stay on the walls. #internationaljokeday
 
Twitter
Ancient House Museum
@AncientHouseMus
#InternationalJokeDay
I was at a museum
and I asked a worker there if we were allowed to take pictures.
He told me no, as they had to stay on the walls.
Man in looks closely at a painting of Queen Elizabeth I hanging on a wattle and daub wall.
2:00 AM · Jul 1, 2019·TweetDeck
 
Reddit—Dadjokes
Posted by u/AhPigeons August 4, 2019
I was at the museum recently
I asked a worker there if I was allowed to take pictures.
He said no, they had to stay on the walls
   
Twitter
Dad
@ImYourDad___
I was at a museum yesterday, I asked if I was allowed to take pictures
The worker said no, they had to stay on the walls
1:15 PM · Aug 4, 2019·Twitter for iPhone
 
LaffGaff 
By laffgaff August 14, 2019
Museum Worker Joke
I was at the museum recently.
I asked a worker there if I was allowed to take pictures.
He said no, they had to stay on the walls.