Never Trust The Client
In software development, all data validationshould be done by the server to help stop abuse, such as SQL injections. If the client did this instead of the server, someone could easily modify the client so that it doesn't stop sanitise the data, thus allowing the attack to work.
Doing a Nuttcase is a when a person commits an act of stupidity to gain respect and/or for pure hilourity. Also Nuttcase is the name of a person, Joe "The Nuttcase" Nuttall, who inventedthe term.