“The man who gets into a cage full of lions impresses everyone but a school-bus driver”

“The man who enters a cage of ferocious lions impresses everyone but a school bus driver” is a jocular line that tells of the difficult job of a bus driver. “The man who gets into a cage with a dozen lions impresses everyone but a school-bus driver” was cited in The Rotarian in October 1963.
 
     
Google Books
The Texas Outlook
Texas State Teachers Association
Volume 49
1945 (The Google Books date may be incorrect.—ed.)
Pg. 57:
The man who enters a cage of ferocious lions impresses everyone but a school bus driver.
 
Google Books
October 1963, The Rotarian, “Stripped Gears,” pg. 63, col. 2:
“The man who gets into a cage with a dozen lions impresses everyone but a school-bus driver.”—Rotary Booster, FAIRBURY, ILLINOIS.
 
Google Books
The Modern Handbook of Humor
By Ralph Louis Woods
New York, NY: McGraw-Hill
1967
Pg. 313:
The man who gets into a cage full of lions impresses everyone except a school-bus driver. — Rotary Booster, Fairbury, Ill.
 
23 March 1971, Newark (OH) Advocate, “The Light Touch” by Jim Hull, pg. 12?, col. 8 ad:
The man who steps into a cage with a dozen lions impresses everyone except a school-bus driver.
(Hull’s Sporting Goods.—ed.)
 
27 August 1980, The Oregonian (Portland, OR), “Today’s Chuckle,” pg. 1, col. 1:
The man who gets into a cage full of lions impress everyone except a school bus driver.
   
Google Books
20,000 Quips & Quotes
By Evan Esar
New York, NY: Barnes & Noble Books
1995, ©1968
Pg. 186:
Everyone is in awe of the lion-tamer in a cage with half-a-dozen lions — everyone but a school bus driver.
 
Google Books
Phillips’ Treasury of Humorous Quotations
Edited by Bob Phillips
Wheaton, IL: Tyndale House Publishers
2004
Pg. 228:
SCHOOL BUS DRIVERS
Everyone is in awe of the lion tamer in a cage with a half-dozen lions — everyone but a school bus driver.
 
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“Everyone is in awe of the lion tamer in a cage with half a dozen lions—everyone but a school bus driver.”
10:46 AM - 21 Dec 2009