#2826: Gold
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[Cueball holding some small sparkling thing, implied to be a gold wedding ring]
Cueball: It kinda makes sense that we use gold for wedding rings.
[Frame shifts to Cueball's head]
Cueball: Because a lot of the universe's gold was probably produced by R-process nucleosynthesis when pairs of neutron stars spiraled together and merged.
Cueball: So gold exists because two neutron stars got married.
[Megan walks in from side towards Cueball]
Megan: "Binary neutron star merger" would be a fun wedding theme.
Cueball: Everyone has to try not to catch the relativistically-ejected bouquet.
(Sourced from explainxkcd.com)
Title text:It can be expensive to hire a professional spectroscopist for your wedding, but the quality of the spectra you get is worth it.