Of course I can :)

In perl6 the opening paren (() of a function cannot be separated from the function by whitespace:

Legal in perl5:

 my $foo = foo( 1 );          # A
 my $foo = foo(1);            # B
 my $foo = foo (1);           # C
 my $foo = foo      (    1    # D
           );
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For reasons I explain in my style guide MY preference is C. Perl6 only supports A and B.

This is only an example. The syntax rules go deeper than that, causing the dot (.) to be special too, so that

my $foo = $object->method (1)
                 ->method (2)
                 ->method (3);
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chaining as allowed in perl5 (break to a newline wherever you like), would NOT translate to

my $foo = $object.method(1)
                 .method(2)
                 .method(3);
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This is bad (IMHO), see:

$ cat t.pl
use v6;

class C {
   has Int $.x is rw = 0;

   method foo (Int $i) { $!x += $i; return self; }
   method bar (Int $i) { $!x -= $i; return self; }
   }

C.new().foo(1).bar(2).say;
$ perl6 t.pl
C.new(x => -1)
$ cat t.pluse v6;

class C {
   has Int $.x is rw = 0;

   method foo (Int $i) { $!x += $i; return self; }
   method bar (Int $i) { $!x -= $i; return self; }
   }

C.new()
 .foo(1)
 .bar(2)
 .say;
$ perl6 t.pl
===SORRY!=== Error while compiling t.pl
Two terms in a row
at t.pl:11
------>  ⏏.foo(1)
    expecting any of:
        infix stopper
        infix or meta-infix
        statement end
        statement modifier
        statement modifier loop
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This is because a leading dot (after whitespace) will see the next word as method on the current topic ($_) instead of as a method on the previvious "thing". As the previous line has no trailing semi-colon, I would prefer the default to be different. The perl6 core dev people state it is possible with a backslash:

cat t.pl
use v6;

class C {
   has Int $.x is rw = 0;

   method foo (Int $i) { $!x += $i; return self; }
   method bar (Int $i) { $!x -= $i; return self; }
   }

C.new()\
 .foo(1)\
 .bar(2)\
 .say;
$ perl6 t.pl
C.new(x => -1)
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But do you want your code to look ugly like that? I do not!