stop
hammer time

Where funny?
This is just a guy using his tools like god intended to.

See, the problem is OP didn't properly counterwight the hammer around the axis of rotation, causing the drill to lose control.
Additionally, he was using a spinning motion to apply a rotating applied force when hammers are better used when applying a linear force. The only reason humans swing a hammer is because it is the best way to generate the momentum required using the human limbs, and we generally use such a large radius that the hammer is essentially traveling in a linear path. OP using a drill as the axis of rotation only had less than the length of the hammer arm as a radius which resulted in a more "rotational move."
I applaud the attempt at making a consumer power hammer (all we have is the commercial jack hammer), but unfortunately this failed.