LISA is going to be cool. And not just for your astro-related dreams. Theoretical physicists can have fun too! This community-wide manifesto illustrates just how cool things are going to be with LISA. LISA will constitute a major milestone to test gravity, cosmology, the nature of black holes, etc. A big thanks to all those involved.

Enrico Barausse, et al. (322 authors incl. Davide Gerosa).
General Relativity and Gravitation 52 (2020) 8, 81.
arXiv:2001.09793 [gr-qc].