A strange beast

The Alzheimer's mind is a strange beast. One minute it is "okay" and the next it is scrambled and jumbled.
 This morning Bob was doing pretty good and even got out some of his leather work and was messing around with it. I could see he was struggling but he knew what it all was, and which tool did what.
 After an hour or two he got up to go to the bathroom and then the kitchen to have a snack. When he came back to his desk he  wanted to know-
 " Who left all this smelly crap on my desk and why..."
Yes-- the Alzehimer's mind is a strange beast indeed.