The Raid sponsorship was really common at some point and there were quite a few memes about it so I think while it probably has become less common it has a place in this meme.
I'm not sure ze Germans would let me call that bread. Most loaves of bread I see (admittedly not at Aldi) start around 1.20€ for the smaller ones which I would have difficulty cutting into 20 slices. But maybe white bread with enough air in it is indeed that cheap.
Edit: I would assume that it won't be very satisfying.
Since sailing requires you to push against something (the water) if that same something is the thing blowing in your sails it will just push you without really giving you much control. Instead if the currenents are a lot stronger deeper down it might work but then there's nothing keeping the sail downright(?) meaning without a comparatively heavy (because water is heavy) weight at the bottom of your sail you will likely capsize or more likely just be at an angle where you're not accelerating much.
Which is basically just counting a certain distance as long as it's just integers.