IT Security

from here and here

Of course you won't be able to access the data either, but at least other people can't get it.

(There is no clown, just other people's nightmares)

Now that is a special character

from here and here

Logon the clown hates repetition.

Logon the clown is a capitalist, but only some of the time. 

Logon the clown wants your digits.

Logon the clown hates $@%* words.

Logon the clown believes size matters, but Logon the clown has limits.