Ever so simple, this one. Just describe a totally pointless activity. Like ... Counting the number of street lamps between your home and your place of work
I can't play because I just realized that so many of the best answers are sexist remarks that are really dated and unfair!
Oh! I've got one! Walking upstairs on the down escalator; or walking the wrong way on a moving sidewalk.
Saw no end of people doing that last time I visited a gym. Some of them were even running ... :mickey:
Trying to vacuum up pet hair while it is flying around the room only to settle again once you put the vacuum away.
