apt-get -qq and warning about possible modification

[Murukesh Mohanan <murukesh.mohanan@gmail.com>]

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?

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Murukesh Mohanan