  The recent discovery of low-mass red giants with enhanced atmospherical Li
abundance in galactic low-metallicity stellar clusters adds to the mysterious
phenomenon of the Li-rich giants. We propose a combined scenario for the
Li-enrichment: engulfing a giant planet (or brown dwarf) by a red giant
(external source) activates inside the giant the "7Be-mechanism" producing Li
internally. This episodical Li-production can happen at any time on the red
giant branch and is naturally followed by Li-depletion as is observed.
Limitations of our scenario are discussed as well.
