text: Peter: are shops open this sunday??
  Lance: i am afraid not, they are open on the next one for sure
  Peter: fuck... my fridge is empty
  Lance: dude it's easy to remember - first and last sunday of the month shops are open, as for the rest - they are closed
  Peter: i know... i can't get used to it... shit
  Lance: you can come over, i can feed you haha
target: Peter doesn't know when the shops are open, and when they are closed. Lance finds it easy to remember.