The most popular trust-creation mechanism for adults seems to be getting drunk together, which reliably leads to little infractions, which every witness has the choice to exploit or not. The latter option engenders trust.
"I don't trust someone that I didn't get drunk with" is a sentiment I've heard repeatedly, both privately and professionally. The most successful startup that I worked for even asked "What's your favourite beer?" when they interviewed me for a programmer position, and when I asked by this was of interest, they said they took their after work drinking sessions pretty seriously, and "don't want to work with people they can't have fun with". As somebody who doesn't enjoy being drunk, this was difficult for me to adapt to.