Other shortages have meant that patients may get a substitute medicine their doctor may not be as familiar with.
It may be several days before you can get a substitute; in some cases you may not be able to get one at all.
You get a substitute organist at church who plays with a lot of flash and pulls out the trumpet stops and he makes you appreciate your old ordinary organist who isn't that good and knows it.
Ford, which has stopped taking orders for vehicles to be painted "tuxedo black" and is building fewer models in several red hues, is studying whether it can get a substitute from another supplier, according to a company spokesman, Todd Nissen.
It took months of arm-twisting to get a substitute bond issue off the ground, and even then many bonds were left in the hands of one of the lead managers.
For instance, once Donny and Davey reach Padraic — he gets the news about his "sick" cat on his cell phone as he's about to remove the nipple of a drug dealer who has been hung upside down from the ceiling — they have to get their story straight; they also have to get a substitute black cat.
Christie Rampone, the United States national team captain, ran to Wambach and found a calm and aware teammate who told her in rapid-fire succession to tell Coach Pia Sundhage that she had broken her tibia and fibula, that she would miss the Olympics, and, oh yes, you had better get a substitute ready.
So although that was not quite the situation when Sergi Darder limped off the pitch during Tuesday's Lyon-Valencia match, we stood and applauded when Valencia's Alvaro Negredo eschewed niceties and took a quick free-kick while Lyon were still trying to arrange to get a substitute on to the pitch.
Churchill, who had delivered the speech to Parliament earlier in the day, was too busy to repeat it for broad-cast, so he asked the BBC to get a substitute.
It was well worth it, she says, to use all of her vacation days for the year, to get a substitute for the music classes she wouldn't be teaching, and to borrow from her parents to go to rock 'n' roll camp.
