Something we did as orientation leaders was to do skits for the freshman on things like drinking and drugs, academic cheating, safe sex, ways to reduce your chances of being a victim of crime and rape, etc. Some of the skits were kind of silly (hungover and missed the test!!), some were serious (STD or pregnant!), and others downright heavy (rape or injury), but overall, they were pretty effective.
The important thing is to present the outcome/aftermath of different behaviors, and depending on your judicial/standards process, you can do a mock "trial" or and how punishments or sanctions would affect you. If you play it honest, people will likely respond. Think about the behaviors, the possible initial outcomes, the punishment, and the fallout. Often, people just look at the immediate consequences, and not what else can happen down the line. This is a chance to make them think about those not-so-fun things.
Remember the Youtube video of the "sorority girl" who just "wanted to make it snow"? Sure, deciding to pull a fire alarm might "only" lead to a fine and "school probation" for you, but what else is at stake? Act out the fire department getting late to a burning building and someone being stuck inside (serious), or the sorority having to pay the fine out of their recruitment budget and having to do a "lame theme with crepe paper" (funny).
To get people's attention, focus on the emotional realities of poor decisions and the ripple effects. Good luck; it's a big responsibility.
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