Not sure if your comment is sarcastic, but I'll humor it. Jupiter is orbiting the sun at 13 km/s (very fast). If you slingshot around it, you can definitely be

Not sure if your comment is sarcastic, but I'll humor it. Jupiter is orbiting the sun at 13 km/s (very fast). If you slingshot around it, you can definitely be moving away from it at a decent clip. However, you'll still be going around the sun at a pace near 13 km/s (very fast). You still have to lose all of that orbital velocity before you can even think about going in the other direction. And even if you reduce your orbital velocity to zero, now you're just going to fall into the sun. You need to add the bulk of what you just lost back into your orbital energy, but going the other direction. All of this has to be precicely manuvered to put you in an orbit to meet up with the probe. On top of all of that, you still have to climb out of Earth's gravity well and spend a lot of fuel getting to Jupiter. Also, once you start going the other direction, gravity assists become much more difficult to do with anything spinning normally. Inversely, if you don't turn around, you'll just wiz by the object when you meet up with it and have hardly any time for science.