bgp bestpath as-path ignore - Wow a hidden command to freak network engineers

Rack1SW1(config-router)#bgp bestpath ?
  compare-routerid  Compare router-id for identical EBGP paths
  cost-community    cost community
  med               MED attribute

Rack1SW1(config-router)#bgp bestpath as-path ignore
Rack1SW1(config-router)#end
Rack1SW1#sh run | i
*Mar  1 02:13:46.567: %SYS-5-CONFIG_I: Configured from console by console
Rack1SW1#sh run | incl ignore
 bgp bestpath as-path ignore <-- a command like test crash :D
Rack1SW1#

Rack1SW1#test crash
WARNING: Command selections marked with '(crash router)' will crash
         router when issued. However a selection 'C' will need to
         be issued IMMEDIATELY before these selections to enable them.


Type the number for the selected crash:
--------------------------------------
 1  (crash router) Bus Error, due to invalid address access
 2  (crash router) Bus Error, due to parity error in Main memory
 3  (crash router) Bus Error, due to parity error in I/O memory
 4  (crash router) Address Error, due to fetching code from odd address
 5  (crash router) Jump to zero
 6  (crash router) Software forced crash
 7  (crash router) Illegal read of address zero
 8  (crash router) Divide by zero
 9  (crash router) Corrupt memory
 A  (crash router) Test assert() failure
 C  Enable crash router selection marked with (crash router)
 P  (crash router) Test assert_production() failure
 R  (crash router) User enter read bus error address
 U  (crash router) User enter write bus error address
 W  (crash router) Software watchdog timeout (*** Watch Dog Timeout ***)
 w  (crash router) Process watchdog timeout (SYS-2-WATCHDOG)
 d  Disable crashinfo collection
 e  Enable crashinfo collection
 i  Display contents of current crashinfo flash file
 m  Write crashinfo on crashinfo RAM
 n  Change crashinfo flash file name
 q  Exit crash menu
 s  Save crashinfo to current crashinfo flash file
 c  Close current crashinfo flash file
 t  Write crashinfo on console TTY
 x  Exit crash menu
?