... which will be grateful to you for ALL ETERNITY), it lasts between 20 years and 10 centuries.
10 centuries is not bad but it's still modest compared to the idea that I had of eternity ...
Notwithstanding this consideration, offering a book is a good idea, especially since it is possible to personalize the gift to infinity. So, for example, for a pest you can take sweet revenge by making him present "Memoirs of Edgar Faure" * ...
* Generally speaking, auto-biographies very often correspond to this criterion.