Mark Oestreicher has a new post about some of the "crazy" and "stupid" things he has done in youth ministry and many other readers have chimed in to share their experiences. I myself remember doing some pretty stupid/crazy (i.e. unsafe) stuff with teens in my early years, sometimes because I was too dumb to know we were being unsafe and sometimes because I just thought it would be cool or fun.
That said, let me share my number one safety issue that I wish more youth pastors took seriously: when driving anywhere (whether it's down the block or halfway across the country), all youth and adults in our care should be wearing seat belts -- no exceptions. Relatedly, when traveling on highways in youth vans and the like, follow the rules about maintaining safe stopping distance between yourself and the cars in front of you (at least one car length for every 10mph). Tailgating at 70mph in a van or bus isn't a good idea for anybody.
Other safety tips we should remember?