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I do that sometimes between chores, because with small kids to look after, it's often either that or nothing. Observing Venus' crescent with the Galileoscope while cooking dinner is a favourite. However I leave the windows shut usually. This has led me to two useful discoveries - 1. our windows are pretty flat, optically, save for a few "zones" and still allow crisp images between 50x and 100x depending on the window and the elevation of the target*, and 2. it's a great way to judge the seeing before setting up anything out back later in the night.
*Not surprisingly, there seems to be an optimum elevation - around 50° perhaps - where the combined effects of looking through the window glass at an angle and atmospheric interference is minimised.
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