While PERSON@1 often does things at the expense or detriment of his housemates , he rarely expresses the sort of open hostility that the others do , and seems to cause them trouble only when it benefits him , rather than out of sadistic joy .

While PERSON@1 often does things at the expense of his housemates , he usually does n't show the sort of open hostility that the others do , and seems to cause them trouble only when it benefits him .
