will laugh their *** off for an hour-and-a-half 
(ROOT (S (VP (MD will) (VP (VB laugh) (NP (PRP$ their) (NFP ***)) (PRT (RP off)) (PP (IN for) (NP (DT an) (NN hour) (HYPH -) (CC and) (HYPH -) (AFX a-) (NN half)))))))
(ROOT (S (VP (MD ) (VP (VB ) (NP (PRP$ ) (NFP )) (PRT (RP )) (PP (IN ) (NP (DT ) (NN ) (HYPH ) (CC ) (HYPH ) (AFX ) (NN )))))))