『越硬越好還(huan)是越大越好』介紹:由于(yu)(yu)匪徒(tu)劫持,一(yi)對雙胞兄(xiong)弟(di)剛出生(sheng)即(ji)遭分離。弟(di)弟(di)玩(wan)命(ming)(ming)(成(cheng)龍)被(bei)舞女(nv)撿到撫養(yang)長大,終日(ri)浪(lang)跡于(yu)(yu)社會底層(ceng),為幫(bang)朋友(you)泡(pao)妞,他(ta)結識了(le)歌女(nv)芭芭拉(張曼(man)玉),因此得罪(zui)黑(hei)社會;哥(ge)哥(ge)馬友(you)(成(cheng)龍)被(bei)一(yi)對有錢(qian)夫婦帶去(qu)美國,接受了(le)良好教育(yu)長為著名音(yin)樂(le)家,回港開(kai)音(yin)樂(le)會時,結識世伯家的女(nv)兒唐心(利(li)智)。陰差陽錯(cuo)中,兩(liang)人互換角色(se)進入(ru)對方生(sheng)活,由于(yu)(yu)大家分不清誰是馬友(you)誰又是玩(wan)命(ming)(ming),笑話迭(die)出,芭芭拉與(yu)唐心的心思也漸起變化。音(yin)樂(le)會上(shang),玩(wan)命(ming)(ming)胡指亂揮不想大獲成(cheng)功,而馬友(you)在黑(hei)幫(bang)威(wei)逼下,開(kai)車去(qu)救(jiu)被(bei)黑(hei)幫(bang)抓(zhua)做人質(zhi)的玩(wan)命(ming)(ming)的好友(you)泰山,隨后,兩(liang)兄(xiong)弟(di)開(kai)始連(lian)手共(gong)斗強敵(di)。