Most modern switches and routers today are based on a Linux or *BSD-flavoured operating system.  It's a given that these operating systems are fairly complex but what boggles my mind is when vendors ship them with their products and don't bother cleaning up the initialization scripts.

For example, Junos:

Attaching /cf/packages/junos via /dev/mdctl...
Mounted junos package on /dev/md1...
A
Media check on da0
Automatic reboot in progress...
** /dev/da0s2a (NO WRITE)
** Last Mounted on /
** Root file system
** Phase 1 - Check Blocks and Sizes
** Phase 2 - Check Pathnames
** Phase 3 - Check Connectivity
** Phase 4 - Check Reference Counts
** Phase 5 - Check Cyl groups
161 files, 75937 used, 74101 free (21 frags, 9260 blocks, 0.0% fragmentation)
mount reload of '/' failed: Operation not supported 

-a: not found
-a: not found
-a: not found
-a: not found
-a: not found
-a: not found
-a: not found
-a: not found
-a: not found
-a: not found
Checking integrity of BSD labels:
  s1: Passed
  s2: Passed
  s3: Passed
  s4: Passed

That -a: not found bugs my OCD and makes me worry that the -a argument was ignored because it was treated as a file.  The mount error is fun, too.

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