C.S.
When my son was younger he LOVED to play with an empty 2 liter bottle so when my MIL asked what to get him for his first birthday I joked and said "an empty 2 liter bottle". Well she took it to heart and wrapped one up- that was his favorite gift! I felt bad for the other guests at the party who watched as their fancy musical/light up gift was tossed aside for the 2 liter diet coke bottle :)