At midday the heat coils round the feet of bus passengers. If, placed on a long neck, a stupid head adorned with a grotesque hat should chance to become inflamed, then a quarrel immediately breaks out. Very soon to become dissipated, however, in an atmosphere too heavy to carry ultimate insults very vividly from mouth to ear.
Thus one goes and sits down inside, where it's cool.
Later can be posed, in front of stations with double courtyards, sartorial questions about some button or other which fingers slimy with sweat self-confidently fiddle with.