“I build yachts in my attic. Sails are going through the roof”

“Sales/Profits are going through the roof” is an expression meaning that a business is generating a lot of money. One pun on “sales”/“sails” is:
 
“I started a business building yachts in my attic. Sails are going through the roof!”
 
The joke has been cited on Twitter since at least June 2, 2010.
 
Another “through the roof” joke is: “I opened a company selling land mines that look like prayer mats. Prophets are going through the roof.”
   
 
Twitter
Marc Tessier-Ashpool
‏@lastcyberpunk
I’ve got a new business making yachts in my attic.
Sails are going through the roof.
5:10 PM - 2 Jun 2010
 
Twitter
Andy Willetts
‏@andywilletts
I’ve started a new business building yachts in my loft. Sails are going through the roof.
5:19 PM - 2 Jun 2010
 
Facebook
innocent
April 12, 2013 ·
Right then, time for a dad joke and a continuation of last week’s nautical theme. Over to you, pops:
“I’ve started a business building yachts in my attic. Sails are going through the roof.”
 
Twitter
sickipediabot
‏@sickipediabot
I’ve started a business building yachts in my attic.
Sails are going through the roof.
9:18 PM - 13 Apr 2013
   
Punography
Posted on
Thursday, June 5th, 2014
(...)
I have a very successful business building yachts in the attic; sails are going through the roof.
 
reddit
I’ve started a business building yachts in my attic
submitted June 20, 2016 by jiroshimaaa
Sails are going through the roof!