The line which you always seem to get onto at the supermarket checkout, the highway tollbooth line or in the bank.
The former always has someone who has a limited supply of cash and no credit card so they have to withdraw some items from their cart and wait for the checkout girl to recalculate and say "you're still 9.69 dollars over".
Or in the second, someone who drops his change and has to stop and scramble under his car.
Or in the latter, you are behind someone who suddenly pulls out wads of cash from his under his shirt for depositing in different accounts.
Damn! I'm in a hell of a hurry, and I got into the idiot's line at the supermarket.
When a person says something stupid and doesn't know any better, then says that they were joking to make themselves seem less dumb.
P1: Did you know that 50% of people who drink water die!?
P2: No, It's 100% because everyone has to drink water to survive
P1: I was kidding!
P2: God you're such a schrodinger's idiot.
A phrase or saying that describes the degree to which ones idiocy extends, this degree being astronomical, hence the use of the term "Hubble" relating to the Hubble's Space telescope.