60s picnics by the side of the road. For reasons that are unfathomable to me now, my parents, while on our family holiday trips, thought it was a great idea to park on the verge by a busy holiday route main road and have a full scale picnic. This was complete with primus stove providing a range of cooked meals.
Not only that but everyone did it. There was keen competition to grab a pitiful few feet of grass on which to eat while breathing in the exhaust fumes of heavy slow moving traffic going up, say, the A12 at Kessingland where the road was lined with cars and people were going from spot to spot trying to scrounge some key ingredient they had forgotten.
It was great fun at the time but still seems bizarre in retrospect.