Buuxi weedhan soo socota: Watson wuxuu ku dhashay Bristol hooyadiis waa reer Wales aabbaheedna waa Ingiriis. Wuxuu leeyahay walaalo mataano ah oo la yiraahdo Emma iyo Lucy iyo walaal, Paul. Wuxuu dhigan jiray Henleaze Junior School ka dibna Bristol Grammar School, oo ah iskuul maalinle ah oo madaxbanaan halkaas oo uu ku guuleystay abaalmarinta 'Gabbler of the Year', ka hor inta uusan aadin Queens 'College, Cambridge, halkaas oo uu ku bartay Ingiriisiga, isagoo ku qalin jabiyay sharaf heer sare ah. Jaamacadda wuxuu xubin ka ahaa kooxda Footlights oo uu la joogay Stefan Golaszewski, Tim Key iyo Dan Stevens. Wuxuu ka mid ahaa riwaayaddii loo magacaabay abaalmarinta xiddiga ugu fiican ee cusub ee
Perrier Comedy Awards ee 2001 Edinburgh Festival Fringe iyo sidoo kale wuxuu wada-diray revue-ka Key.