This video is about quick hands. Android 8 goes to a scientist to have the bomb inside of him removed.
The scientist is successful in removing the bomb.
He is so relieved he wipes the sweat from his forehead.
When he does, he drops the bomb.
In the 1 or 2 seconds it takes the bomb to fall from the forehead of the scientist to Android 8’s heart, Goku reaches in and grabs the bomb.
This is not a cartoon trick. Kung Fu practitioners can develop very fast reflexes. That is one way Kung Fu skill can be tested. There is a scene in a movie called “Crouching Tiger, Hidden Dragon” in which one martial artist purposefully knocks a tea cup off the table to test the skill of another martial artist. The test is whether or not the other martial arts woman catches the tea cup before it spills.