"If you aren't in a hurry to leave the store, there will be little or no delay in getting a clerk to ring you up. But if you're pressed for time --- or even more so, if you're car-pooling with someone who is on a tight schedule --- THAT'S when there will be hold-ups galore... a long line in front of you, a customer with one or more heaped-full shopping-carts, one or more price-discrepancies that hafta be tediously resolved (i.e., the puzzled clerk is obliged to walk back with you to the shelf to look at the price-labels, a supervisor or the store-manager has to be called over), a balky card-scanner, etc."
Whenever someone who's giving me a ride is kind enough to let me stop at a store to grab a few items, I always try to make very sure that I have everything all "set and prepared" before I head to the register, so that I personally seldom create a problem (i.e., cause any delays myself with issues like not having the proper payment ready or being unsure of a price or quantity) with Murphy's Law of Checkout-Lines. That way, even if my driver has to wait linger than expected for me to hastily scamper back outside with my loaded shopping-bags, he won't be able to direct his impatient frustration at me --- "Sorry for the delay; I did indeed get everything tossed in my cart very quickly, but there was a long line in front of me, and they were short-staffed today, so they only had once register open."
by QuacksO October 31, 2019
Get the Murphy's Law of Checkout-Linesmug. My co-great-pibling-in-law is a good person.
by Elivaldeq November 24, 2019
Get the co-great-pibling-in-lawmug. 
Get the half-co-sister-in-lawmug. Spouse's stepsibling's husband.
My step-co-brother-in-law is a good person.
by Wonbig October 13, 2021
Get the step-co-brother-in-lawmug. Similar to the old "wax your car if you want it to rain" joke, this saying reads: "It can be mild and sunny for days on end, but then just as soon as you hang out a whole bunch o' laundry to dry, THAT'S when da sun will abruptly disappear behind huge dark clouds and you'll have a bleepin' MONSOON FOR A WEEK!"
The weather had been totally "bright 'n' balmy" for a good while, and so one afternoon last week I tried to save money and electricity by using my clothesline instead of the watts-sucking dryer, but then it rained heavily during the night, and it's been foggy and drizzly ever since! Sounds like a classic case of "Murphy's Law of Clothes-drying" to me.
by QuacksO October 30, 2018
Get the Murphy's Law of Clothes-dryingmug. 
Get the half-co-aunt-in-lawmug. April 11th is international break the law day. On this day you are supposed to post a picture of you breaking the law on Social Media or post a photo of an illegal item in your possession.
by LobsterMaster April 11, 2021
Get the International Break the Law Daymug.