When i note someone that he make x4bb raise or making a re-raise and there are few callers& I hold some trash like 3 7off i always make the call. 9/20 of the times i make a flop str8 or sth like that, when you note players which they play heavy cards (ONLY) its not mistake to check your trash cards. The chances are the same AK or 29 - to hit something at the flop. Better if you wait for 3-7 suited or 8 4 8 5. Its a pretty badass system at tourneys.