Are yer getting mixed up with nuts 'n coal eggs? We used to use my Dad's dinky little hammer, the strength of use depending on the nut - a gentle tap for a hazelnut, a little heftier for a walnut, making sure the 'seam' was uppermost, and a good clout for a Brazil, which invariably cracked in half with the two nut halves still encased in shell.
In the 'old' days Christmas was just Christmas. Now it's got an alternative name - Holiday. Have a Happy Fuckin' Holiday. It's a Christmas holiday, yer bastards.