ki blast?

purely hypothetical,
but im watching tv. or cartoons really. a pretty popular one,
(it might come off as silly or immature) -shruggs-
dragon ball z. and these guys are firing off these crazy burst of energy.
it got me to thinking is this possible? like not on some grand scale with all the lights, bangs and, flashes.
but can a person form energy in there hands, and then project it out fast enough and dense enough would it sting or harm?
remember this is purely hypothetical.
i have a couple of idears of my own on how one might do it. i mean it seems straight forward enough.
but i like to know other peoples ideas.
and nope im not gona learn how to shoot people with energy blasts, and do it.
thats like having a gun and shooting people just because lol.