The plot behind My Cousin Vinny. Two people from out of town are arrested, one thinks they are being arrested because he unthinkingly pocketed a can of tuna or

The plot behind My Cousin Vinny. Two people from out of town are arrested, one thinks they are being arrested because he unthinkingly pocketed a can of tuna or something when his hands were too full to carry it all to the register and owns up to "I did it!" before knowing what he is confessing to, the other in shock repeats "I killed the clerk?" instead of rebutting it, which is taken as a confession rather than a baffled and shocked query.