Look left, look right... look up?

I managed to upset some shoppers outside a supermarket today. 'Tweren't intentional by any means, but I'll admit I should have been paying more attention. The entrance to the supermarket seems geared for cars and the like rather than for pedestrians such as myself. Approach it from a particular direction and you have to cross a small stream of traffic, as well as navigating the automatic barriers whose sole purpose (to me in my capacity as hapless pedestrian) seem to cause a snarl up of motor vehicles. Navigating between the cars whilst trying to get into the supermarket, I was somewhat startled to feel something thud down upon my shoulder. The bright yellow and black stripes immediately identified it as one of the barriers (either my thoughts were elsewhere, or it wasn't painted a bright enough shade of yellow to catch my attention. I'll let you decide which). Naturally the the two attendants manning the barriers immediately rushed to the aid... of the barrier, which now seemed stuck at my shoulder height (which isn't really all that high). The shoppers waiting in their cars to exit the car park glared menacingly at me as the attendants tried to get the barrier operational again. The attendants also threw me a sidelong glance of discontent.

I snuck off into the supermarket nursing a bruised shoulder and bought myself lots of milk to cheer myself up.