if anyone out there is trying to get the heart attack trophy, the best way to do it is to stand behind the bar type area so that you are not in danger of damaging the hot dog cart, do this for the first four waves and then when the boss appears, leash or kick his helmet off first, get him to go up the stairs to the top floor and then stun him again, kick the hot dog card right next to him (kick it don't leash it) and then blow it up, this seems to be the best strategy