Here's one we used to do in college. I don't know if it's the custom elsewhere, but in America, giving a girl your fraternity pin was serious business. "Being pinned" was a step above going steady, but not quite engaged.

It's sung to the tune of "Don't Fence Me In."

Oh, when we're drinkin' and you're thinkin' that I'm thinkin' of romance,
Don't take my pin.
Love is swell, what the hell, give the other girls a chance,
Don't take my pin.
I know that I am the one and there is no other;
I know you'd like to take me home to meet your mother;
But can't you get a pin from my fraternity brother?
Don't take my pin.

Just take my love, take my flowers, while we while away the hours,
And I prove that I am tru-ue.
Just take the change from my pocket take my sterling silver locket
That's engraved with I love you-u.

Just take my grey Chevrolet with the windshield wipers,
My Tommy Dorsey records with the four Pied Pipers,
But if you take my pin I'm gonna lose my diapers;
Don't take my pin. (Oh, no, Baby don't you take my pin.)