My 3 fondest memories are:
1) Shaking Pres Hinckley's hand and speaking with him briefly at a mission devotional (his son was our MP)
2) Eating M&Ms w/Elder Wirthlin in his living room as he told us about what would become Preach My Gospel
3) Pres. Faust getting upset w/the owner of Hires Big H because he wanted to pay for our lunch but someone had beat him to the punch