The latest from our collaboration with the Ebbesen group on Vibrational Strong Coupling is published in Angewandte Chemie. We disclose an optical cavity that can fit in a standard NMR tube, allowing to directly observe the effects of VSC by NMR. The technique is showcased by using Schreiner’s molecular balance for London dispersion forces to probe how those forces change under VSC. Congrats to Bianca, Maciej and all the other authors!