Monday:

_morning_
no social worries
"how was 'your' weekend" will bail any human out of jail
people are tired
or hungover
or happy
or pissy
or hungry
or busy

_afternoon_
no social worries
"what did you do over the weekend" will bail out your lunchtime talk midday awkwardness
people are jovial
laughy
profane
dirty
manpleasing
robotdestroying

_evening_
depressed
tomorrow is the next day to the 3rd day which is only the midday