Living with Bob and "Al"

Bob got very frustrated when Sheri stopped him from eating for third time last evening. He of course does not cook, but he is somewhat able to make himself a sandwich, so after he had eaten the dinner she had cooked and then an hour later made himself 2 bagel sandwiches and then began again a half hour later to make 2 more sandwiches, Sheri just politely said  "well Bob, you have already eaten blah..blah..blah tonight." "Al" looked over at her, hobbled out of the kitchen whistling, left the toast in the toaster and the bologna on the counter and went to bed. Bob whistles constantly, happy, sad, mad, or tired, so the fact that he was whistling was not a sign that he was okay with Sheri's prompting to stop eating, Sheri knows this because his jaw was clenched tight to one side (the only real sign of anger she has ever seen in him) even as he was whistling Amazing Grace.
What a very strange disease.