How about this:
German corporate law states that once a company (ie Porsche) acquires a stake of 30% in a German company (VW) the buyer has to launch a compulsary takeover bid, although that bid does not have to succeed.
As Porsche wants to bump it's stake to 31% (VW would then be secure, as Lower Saxony and Porsche would have a combined stake of 51%) it too has to launch a takeover, but it doesn't want to have to buy all of VW when it can cement control without paying as much by simply taking a majority stake.
But, to get over the 30% barrier, Porsche will HAVE to launch a takeover bid, but they are doing one that prices VW shares at 100 Euro each, where they are trading at around 120 Euro each. Porsche is hoping (and expecting) that most shareholders will reject the bid as too low, so they won't sell and Porsche won't have to buy the whole company, and will be able to just raise their stake to 31% (there is no other compulsary takeover law until 50% is reached. However, in the unlikely event that some shareholders sell, Porsche is obliged to buy so they have gotten a line of credit just in case they have to buy some shares.