Group Examples: Best and Worst case of subgroup conjugate intersection

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What would be two (M = maximal subgroup,G = nonabelian group) pairs for the smallest possible and largest possible intersection of the subgroup with its conjugates? The smallest intersection is 1 the identity only, and the largest intersection is such that the number of nonidentity elements contained in all conjugates of $M$ is $(|M|-1)|M:G|$.