What makes this a different night than your standard improv set is the source material. The performers aren't riffing on a suggestion shouted from the back row — they're building scenes from things people actually did and didn't tell anyone. That tends to produce weirder, darker, more committed work than "what's something you saw at the grocery store." Bring a group. The pre-show confession card is funnier when you're workshopping it with people who know your actual secrets.
Practical note: improv venues in SF often have tight seating and no late entry once the show starts. Arrive 15 minutes early, pick up your drinks before you sit down, and don't forget to use the promo code from SFFuncheap at checkout to get the discount.
If you only have two hours: get there early, submit something real on the confession card, and sit close enough to see the performers' faces when they read the submissions. That moment is half the show.