dired-do-shell-command munches all memory

[Dan Jacobson]

Want to see emacs eat all the memory, on the machine and have to be
killed? Complete with with real grinding noises.
$ touch a
$ minizip x a
creating x.zip
$ minizip x a
The file x.zip exist. Overwrite ? [y]es, [n]o : n
Then in emacs, do
(dired-do-shell-command "minizip x" nil (quote ("a")))
emacs apparently loops on the above question. Emacs version is in my headers.
$ apt-cache show zlib-bin
Filename: pool/main/z/zlib/zlib-bin_1.1.4-14_i386.deb
Description: compression library - sample programs
 Some generally useful sample programs from the contrib directory.
 Includes a "mini" implementation of `zip' and `unzip' called
 `minizip' and `miniunzip' respectively.