"Broomstick/Frog/Princess/Witch parking only. All others will be toad”—a pun on “towed”—is a jocular sign that has been printed on many images. “Witches Parking Only - All Others Will Be Toad” was printed in the San Francisco (CA) Chronicle on November 7, 1988.

“FROGS PARKING ONLY...ALL OTHERS WILL BE TOAD” is a bumper sticker saying that was posted on the newsgroup rec.humor on September 5, 1994.

“Princess Parking Only” was posted on the newsgroup alt.forsale on May 10, 2007. “Princess Parking Only, All Others Will Be Toad” was posted on Twitter on June 4, 2009.

“Broomstick parking for Witches only-all others will be toad” was posted on Twitter on October 29, 2011. “Broomstick parking only!!  All others will be toad!!” was posted on Twitter on October 31, 2011.


7 November 1988, San Francisco (CA) Chronicle, “Monday-Go-Round” by Herb Caen, pg. B1:
“Witches Parking Only - All Others Will Be Toad.”

Google Groups: rec.humor
BUMPER STICKERS
Nancy Carson
9/5/94
(...)
FROGS PARKING ONLY...ALL OTHERS WILL BE TOAD.

Google Groups: dfw.singles
About last night. . .
Randall Woodman
4/24/95
(...)
Frogs parking only...all others will be toad.

Google Groups: alt.humor.puns
Bumper Stickers...Please Post Some Humorous Ones!!!!
The Paladin’s fool
10/19/96
(...)
Frogs parking only...all others will be toad.

23 February 1998, News & Observer (Raleigh, NC), “Check it out,” pg. C1:
And somewhere in Raleigh: “Witch’s parking only! All others will be toad.”

5 August 1998, Charleston (WV) Gazette, “Only bumpers can have bumper stickers” by Terry Marchal, pg. 1C:
Wicked witch parking only. Violators will be toad.

8 October 1999, The Globe and Mail (Toronto, ON), “Your Morning Smile,” pg. A1:
Sign on a lily pad: Frog parking only, all others will be toad.

Google Books
Religious Innovation in a Global Age:
Essays on the Construction of Spirituality
Edited by George N. Lundskow
Jefferson, NC: McFarland & Company, Inc.
2005
Pg. 214:
I have this bumper sticker that says “Witches’ Parking Only: Others will be Toad.”

Google Groups: alt.forsale
FS: Tin Sign Princess Parking Only - Item #: 427595 via auction
AuctionQuests
5/10/07
Announcement: The following item has been listed for Auction:
.  Item Name : Tin Sign Princess Parking Only

Google Groups: alt.ads
FS: Princess Parking Only Others Toad Parking Sign
Deals @ Atomic Mall
7/28/08
Available now for Instant Purchase @ Atomic Mall:
Item: Princess Parking Only Others Toad Parking Sign
Listing ID: 3658
Price: $10.50
Quantity: 5 available

27 December 2008, Oakland (CA) Tribune, “The Eye on the East Bay,” pg. ?:
WITCHY WOMAN: The Eye spotted three bumper stickers on a Toyota sedan in Pleasant Hill letting others know the driver may have been just as comfortable on a broomstick.

One proclaimed the driver’s affinity for “Wicken.” Another joked: “Witch’s parking. All others will be toad.”

Twitter
kevlars
@kevlars
off A: Princess Parking Only, All Others Will Be Toad.
1:51 PM - 4 Jun 2009

Google Books
Mariposa Road:
The First Butterfly Big Year
By Robert Michael Pyle
New York, NY: Houghton Mifflin Harcourt Publishing Company
2010
Pg. 374:
Up the line in Beauty, the first home hung a banner that read, “Frog Parking Only—All Others Will Be TOAD.”

Twitter
Sky Wyatt
@skywyatt
Broomstick parking for Witches only-
all others will be toad.
8:29 PM - 29 Oct 2011

Twitter
Leann G. Poff
@Leannpoff
Broomstick parking only!!  All others will be toad!!
6:57 PM - 31 Oct 2011 from Kentucky, USA

Twitter
Kamisco
@kamisco_
Broomstick Parking All Others Will Be Toad Halloween Sign - http://CovalentNews.com http://shar.es/IdqsS via @sharethis
1:23 PM - 31 Oct 2013

Twitter
Edinburgh Beauty
@BeautyQuarter
Spooktacular October Offers @ Edinburgh BOOOOO-ty Quarter! 0131 221 1770
Please note broomstick parking only all others will be TOAD away!
1:45 AM - 18 Oct 2017

Reddit—Cleanjokes
Witches’ parking only (self.cleanjokes)
submitted March 15, 2018 by chacham2
All others will be toad.