Una copetencia no delcarada entre Lennon y Mc.Cartney crea dos canciones hermanas: Things we said today y I´ll be back. En medio de estas canciones, Lennon escribe sobre el lado obscuro del amor en You can´t do that.

Letras:

"Things We Said Today"

You say you will love me
If I have to go
You'll be thinking of me
Somehow I will know
Someday when I'm lonely
Wishing you weren't so far away
Then I will remember
Things we said today

You say you'll be mine, girl
Till the end of time
These days such a kind girl
Seems so hard to find
Someday when we're dreaming
Deep in love, not a lot to say
Then we will remember
Things we said today

Me, I'm just the lucky kind
Love to hear you say that love is luck
And though we may be blind
Love is here to stay and that's enough

To make you mine, girl
Be the only one
Love me all the time, girl
We'll go on and on
Someday when we're dreaming
Deep in love, not a lot to say
Then we will remember
Things we said today

Me, I'm just the lucky kind
Love to hear you say that love is luck
Though we may be blind
Love is here to stay and that's enough

To make you mine, girl
Be the only one
Love me all the time, girl
We'll go on and on
Someday when we're dreaming
Deep in love, not a lot to say
Then we will remember
Things we said today.

"When I Get Home"

Whoa-I, whoa-I
I got a whole lot of things to tell her
When I get home
Come on, out of my way
Cos I'm gonna see my baby today
I've got a whole lot of things I've gotta say
To her

Whoa-I, whoa-I
I got a whole lot of things to tell her
When I get home
Come on if you please
I've got no time for trivialities
I've got a girl who's waiting home for me tonight

Whoa-I, whoa-I
I got a whole lot of things to tell her
When I get home
When I'm getting home tonight
I'm gonna hold her tight
I'm gonna love her till the cows come home
I bet I'll love her more
Till I walk out that door
Again

Come on, let me through
I've got so many things I've got to do
I've got no business being here with you
This way

Whoa-I, whoa-I
I've got a whole lot of things to tell her
When I get home, yeah
I've got a whole lot of things to tell her
When I get home.

"You Can't Do That"

I got something to say that might cause you pain
If I catch you talking to that boy again
I'm gonna let you down
And leave you flat
Because I told you before, oh
You can't do that

Well, it's the second time I've caught you talking to him
Do I have to tell you one more time, I think it's a sin
I think I'll let you down (Let you down)
Leave you flat (Gonna let you down and leave you flat)
Because I've told you before, oh
You can't do that

Everybody's green
Cos I'm the one who won your love
But if they'd seen
You're talking that way they'd laugh in my face

So please listen to me, if you wanna stay mine
I can't help my feelings, I'll go out of my mind
I'm gonna let you down (Let you down)
And leave you flat (Gonna let you down and leave you flat)
Because I've told you before, oh
You can't do that, oh

(You can't do that
You can't do that
You can't do that
You can't do that
You can't do that)

Everybody's green
Cos I'm the one who won your love
But if they'd seen
You're talking that way they'd laugh in my face

So please listen to me, if you wanna stay mine
I can't help my feelings, I'll go out of my mind
I'm gonna let you down (Let you down)
And leave you flat (Gonna let you down and leave you flat)
Because I've told you before, oh
You can't do that.

"I'll Be Back"

You know if you break my heart I'll go
But I'll be back again
Cos I told you once before goodbye
But I came back again

I love you so
I'm the one who wants you
Yes, I'm the one
Who wants you, oh ho, oh ho, oh

You could find better things to do
Than to break my heart again
This time I will try to show that I'm
Not trying to pretend

I thought that you would realize
That if I ran away from you
That you would want me too
But I got a big surprise
Oh ho, oh ho, oh

You could find better things to do
Than to break my heart again
This time I will try to show that I'm
Not trying to pretend

I wanna go but I hate to leave you,
You know I hate to leave you , oh ho, oh ho, oh
You, if you break my heart I'll go
But I'll be back again.