The odd jealousy you feel when seeing a favourite album for £4 in Tesco.
The sense of dread when you know your housemate is about to return home with his really annoying girlfriend. And she's drunk.
The strange mixture of unfamiliarity, regret and nudity you feel when shaving off your beard after 3 years.
The particular frustration you feel when your manager reviews and edits your written work, and makes it worse.
The small pleasure of seeing passing bus drivers acknowledge each other.