Nicole has been tracking an interesting idea:
Couples that don't shove cake into each others faces during their wedding reception have a higher chance of having a better marriage.
I was thinking about this last night when I was getting ready for bed and I think I have one reason why this might be the case: When one of the newlyweds decides to shove cake into their spouse's face they are basically deciding that the attention and laughter of others is more important to them than how their partner feels. Obviously that is not a good first step for a marriage, and an indicator or how the person will feel when the initial infatuation love wears off.
As always there are exceptions to the rules, but in general this seems to be the case from what we have seen.