#BOFH excuse #339:

manager in the cable duct
#BOFH excuse #312:

incompatible bit-registration operators
#BOFH excuse #68:

only available on a need to know basis
#BOFH excuse #422:

Someone else stole your IP address, call the Internet detectives!
#BOFH excuse #22:

monitor resolution too high
#BOFH excuse #186:

permission denied
#BOFH excuse #87:

Password is too complex to decrypt
#BOFH excuse #246:

It must have been the lightning storm we had (yesterday) (last week) (last month)
#BOFH excuse #223:

The lines are all busy (busied out, that is -- why let them in to begin with?).
#BOFH excuse #245:

The Borg tried to assimilate your system. Resistance is futile.