“I used to be a tap dancer until I fell into the sink” is a jocular one-line saying that has been printed on several images. “You know, I used to be a tap dancer, but I kept falling into the sink” was posted to the newsgroup alt.callahans on January 22, 1993.
       
   
Google Groups: alt.callahans
Decapitalization?
Karl Siewert
1/22/93
(...)
You know, I used to be a tap dancer, but I kept falling into the sink.
   
Pun of the Day
Great One Liners of the Month - February 1999 
1. I used to be a tap dancer until I fell in the sink.
 
Google Groups: rec.humor.jewish
NJJF: A little Pun-ishment
maxine in ri
5/8/02
(...)
30. I used to be a tap dancer until I fell in the sink.
     
Google Groups: alt.humor.puns
Puns of the Weak Special: 100 Top One-Liners
Stan Kegel
5/25/03
(...)
14. I used to be a tap dancer until I fell in the sink.
 
Google Books
Harry Hill’s Whopping Great Joke Book
By Harry Hill
London: Faber & Faber
2008
Pg. ?:
I used to be a tap dancer but I kept falling in the sink.
 
Twitter
Jennine Jacob
‏@thecoveted
I used to be a tap dancer until I fell in the sink.
3:41 PM - 23 Oct 2008
 
Twitter
Crap Jokes
‏@TheCrapJoker
I used to be a tap dancer..
but I kept falling in the sink
6:30 AM - 7 Jun 2015