“How do you know when a drummer is at your door?” (joke)

One popular drummer joke (among many) is:
 
Q:  How can you tell when there’s a drummer at your door?
A:  The knocking speeds up.
 
The joke has been cited in print since at least 1993.
 
   
Google Groups: alt.guitar
>>>Drummers…...
Steve Davis
3/27/93
drummer jokes
(...)
Q:  How can you tell when there’s a drummer at your door?
A:  The knocking speeds up.
A:  He always comes in at the wrong time.
 
Google Groups: rec.music.classical
Musician jokes v2.0
boB
9/1/94
(...)
Q: How can you tell if a drummer is knocking on your door?  A: He rushes.
 
Google Groups: rec.arts.marching.band.college
Band Jokes
Scott Rankin
1/8/95
How do you know when a drummer is knocking at your door?
-He rushes
 
Google Groups: rec.arts.marching.band.high-school
Band Jokes Are Here! Seriously!
B Coates
2/25/95
(...)
Q.  How can you tell if there’s a drummer at your door?
A.  The knocking speeds up.
 
Google Groups: rec.music.makers.percussion
Drummer jokes
MrHip
4/23/95
(...)
Q.  How can you tell when a drummer’s at your door?
A.  The longer they knock ... the faster it gets.
 
Google Groups: rec.music.classical.performing
Let’s have some more music jokes!
David Rapp
8/28/95
(...)
How can you tell if a drummer is knocking on your door?
The knocking keeps slowing down.
 
Google Books
The Best Musicians’ Jokes
By Bruno Kassel and Carlo May
Pacific, MO: Mel Bay Publications, Inc.
2005
Pg. 39:
How do you know when a drummer is knocking at your door?
The knock always slows down.
 
musicradar
The 23 best drummer jokes ever
Heartbeat of the band, butt of jokes
Joe Bosso August 18, 2008, 12:27 UTC
(...)
How can you tell a drummer’s at the door?
The knocking speeds up.
 
Google Books
The Musician’s Joke Book
By Jim Green
London: Omnibus Press
2010
Pg. ?:
Q: How do you know when a drummer is at your door?
A: The knock speeds up.
 
Pro Guitar Shop
Top 10 Drummer Jokes
May 21, 2013
(...)
10.How do you know a drummer is at your door?
The knocking gets faster and he doesn’t know when to come in!
 
Twitter
Canadian Musician
‏@cdnmusician
Joke of the Day
Q: How do you know when a drummer is at your door ?
A: He speeds up when hes knocking
8:00 AM - 25 Jun 2014