That dreaded feeling of standing in line to only find out that the store only has three pairs of 10.5s and you're the 100th person in line. You could just cop another size and try your hardest to come up on your size. But you shouldn't leave everything to chance. If it wasn't meant to be, it wasn't meant to be. And how do you think that size 13 behind you will feel if you cop the last one and you can't even wear it?