Leaving a wet towel on the bathroom floor may seem a minor issue but it could wreck a relationship. Scientists have identified a list of the most annoying habits that can cause rifts between couples. The study of minor irritations in domestic life has found that people can almost become "allergic" to a partner's foibles. Failure to control that shrill laugh might end in marriage-destroying fury. Among the most annoying habits are failing to hang up towels, leaving a new loo roll on top of the empty one and using a fork as a back-scratcher. Cringe-inducing endearments such as "babykins"...