#1: Operation Plumbbob.
Once upon a time, kiddies, a man named Dr Robert Brownlee, from Los Alamos National Laboratory in New Mexico, was asked to examine whether nuclear detonations could be conducted underground. I guess it was believed that this would be less polluting, though by then we knew our nukes worked and we were mostly doing it because it made a loud noise.
So in Operation Plumbbob, the bombs were placed in deep boreholes, and a 2000 pound steel manhole cover was placed at the top of the shaft.
The first test, the manhole cover just flat-up disappeared. The second test, they ran the highest speed camera they could, and they got the steel cover moving in one (1) frame. They were able to calculate the speed of the manhole cover from that, which came out to 69.5 miles per second.
That's higher than the static escape velocity of the Earth (7 MPS) and in fact of the solar system with a starting point of Earth's orbit.
This test was conducted 29 times.
So we flung 1 ton manhole covers at random into interstellar space as often as we could. Which I approve of. It will give aliens a much clearer view of us than Voyager 1 did. Specifically, it will tell them to stay the fuck away from us. We don't want to be friends. Fuck off. Go home.