On newer double deckers it tended to be because of a vacumn around the front of the bus pulling the windows shut. Usually on the older Leyland Olympians, it was usually because the window had just been replaced and the springs were tighter, so any bumper would cause the window to shut.
B10BLE 4903 used to have problems with windows shutting, which was annoying one summer as the heating was turned on full.
RE: What's annoying you today? V3
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Who needs heroes anyway? Villians have more fun.
Who needs heroes anyway? Villians have more fun.