To remove an element of an array you have to splice it out. This means you have to find the first index of the matching element:

for my $i (0..$#array) {
  if ($array[$i] eq "joby") {
    splice(@array, $i, 1);
    last; # exit loop - only interested in the first match
  }
}
[download]

Your use of shift(@array) removes the first element of the array, not the element you are currently examining.