apt-get -qq and warning about possible modification
The manpage for apt-get says:
Note that quiet level 2 implies -y; you should
never use -qq without a no-action modifier such as -d, --print-uris
or -s as APT may decide to do something you did not expect.
Are there any concrete examples of apt doing something I 'did not expect'? If so, wouldn't that be a bug, even if it is documented behaviour?