I am not so sure this is forgetfulness issue to just doing something so off the wall like the other day.
My son and I work at the same office and I was at a stop light and saw a long strand of my hair on my coat sleeve. I gingerly picked it up then neatly laid it across his leg. He looked at me with the "what the F look", I had this look of unbelief and then start laughing so hard.
The "kid" is laughing "Mom, what the hey. Why did you do that?"
"Honestly, I haven't a clue why" I replied.
I had to pull to the side of the road to clear the tears of laughter from my eyes. We both were laughing so hard and still crack jokes of loose hair.