Well, I was quadruple dared to do it.
Marius walks in on Courfeyrac playing Strip Faro.
Courfeyrac is already down to his hose, but I imagine he's been playing in the same spirit as "my shirt is chafing me...do you mind if I take it off?"
Although the game is partway through, he's invited Marius to join them anyway...after all, Marie-Élise on his left there hasn't even lost her stays yet, and given how poorly Marius is at cards, he'll catch up with them soon.
Alternate title: Traumatising Marius
"The principles of freedom, of humanity, and of justice, will finally triumph over falsehood, tyranny and delusion, and every principle inimical to the interests of the human race" - Edward Despard, 1803