senseless ( r ) marlon wayans is a very talented physical comedian , and it is that gift that brings senseless moments of life . 
alas , moments are simply that , moments , which are not enough to lift this fantasy/comedy above its one-joke premise . 
granted , that one joke is initially amusing . 
when wayans's darryl witherspoon , an economics major at stratford university , hits some dire financial straits , he becomes a guinea pig for a experimental drug that heightens all five senses . 
after some initial side effects and problems controlling his superhuman senses , darryl learns to enjoy the benefits of his abilities and uses them to land a position at a highly esteemed corporate firm . 
at this point , the film sounds more like senseful than senseless , but through some turns of the plot , darryl finds himself only able to use four of his five senses at once , essentially leaving him--yes--senseless . 
this sets up some showcase moments for wayans's gift for physical comedy , especially when darryl loses his sense of feeling and his body goes completely , hilariously limp . 
but these gags , and the gag behind the entire movie , quickly grows stale . 
once darryl is shown without the use of all of the senses , instead of exploring any new comic territory , director penelope spheeris and screenwriters greg erb and craig mazin take the easy way out and simply recycle each form of senselessness . 
wayans approaches each go-round with gusto , but by this point he's simply treading water for the rest of the film's unfunny duration . 
senseless would not be as problematic as it is if it didn't strive to be anything more than a comic trifle . 
however , the raucous and often raunchy comedy is wrapped in a blanket of bogus sincerity . 
darryl goes through the experiment in order to help his cash-strapped family , and this " serious " angle seems to come from an entirely different movie . 
unlike wayans's last starring vehicle , the surprisingly effective ( and serious ) the 6th man , the " emotional " content of senseless is forced and unconvincing . 
any attempt at anything more substantial than broad comedy fizzles--darryl's romance with janice ( tamara taylor ) , a young woman who yearns for a man who is true to himself , does not generate sparks of any kind . 
once his wb television sitcom the wayans bros . comes to an end , the genuinely funny marlon wayans has a promising big-screen future ahead of him . 
but if he continues to associate himself with projects as flat as senseless , his film career could go the way of his once-promising older brother , damon , who is now set to make his comeback--on television .