A popular and obvious pun on “bank balance” was cited in print by at least 2006:
 
“Went to the cash machine yesterday - an old and confused lady asked me to help check her balance - so I pushed her over!”
 
A version not involving an old lady was cited on Twitter on February 9, 2010:
 
“I went to the bank the other day…I asked the banker to check my balance…So he pushed me!”
 
 
Google Groups: uk.rec.humour
Balance
broadssailor
4/28/06
Went to the cash machine yesterday - an old and confused lady asked me to help check her balance - so I pushed her over!
     
ATS (Above Top Secret)
My theory about annoying old ladies
Gemwolf
posted on Jan, 8 2007 @ 02:22 AM link  
Once I was standing behind this old lady at the ATM. She asked me to help check her balance.
So I pushed the old hag over…
 
Twitter
Spiderkitten
‏@spiderkitten
*giggles* he said…I was at the ATM, and this lady asked if I could help check her balance, so I pushed her over…
2:09 AM - 14 May 2007
 
Twitter
Wayne Brennan
‏@brenster316
Went 2 cash machine the other day & this old lady asked me 2 help her check her balance, so i pushed her over.
10:40 AM - 14 Sep 2007
 
Google Books
Dim Wit:
The Funniest, Stupidest Things Ever Said
By Rosemarie Jarski
New York, NY: Random House
2008
Pg. 385:
I was at a cashpoint machine when an old lady came up and asked me to check her balance. I pushed her over.
 
Google Groups: Sunday Swankers
Fw: Bad taste jokes
John Moir
10/10/08
(...)
I was at an ATM money machine when an old lady came up and asked me to check her balance.
So I pushed her over.
 
Twitter
Stephen Bernards
‏@StephenBernards
I went to the bank the other day…I asked the banker to check my balance…So he pushed me!
9:34 AM - 9 Feb 2010
 
Google Books
Roadmap into a Twisted Mind
By Bruno Gagnon
Victoria, BC: FriesenPress
2014
Pg. 74:
A lady standing next to me at the bank said she needed to check her balance… So I pushed her.
 
Google Books
365 Things That Make Ya Go Hmmm
By William Murrell
Lulu Press, Inc, (Lulu.com)
2014
Pg. ?:
164
One day while in a bank, an old lady asked if I could help her check her balance… so I pushed her over.
 
YouTube
Jokes - I went to the bank the other day and asked the banker to check my balance, so she pushed me!
jokesus
Published on Oct 5, 2015
Joke :
I went to the bank the other day and asked the banker to check my balance, so she pushed me!