[X-Unix] Space character in short user name!

[Jerry Krinock]

A AppleScript I sent to a user didn't work because, according to this simpler script, this guy's account somehow has a short name of "MacBook Pro".  Spaces are not allowed in short user names.

Here's the script:

set posixHome to POSIX path of (path to home folder)
set answer to "posixHome = <" & posixHome & ">"
set the clipboard to answer

I told him to run the script and send me what was on the clipboard.  The result:

posixHome = </Users/MacBook Pro/>

How in hell did he get a space in his short user name?  If I create an account in System Preferences and try to type a space character in the short name field, I get a BEEP.