I never started a prank war in college; but, I often finished one.
Got toweled (the guys took my towel and clothes) taking a shower once in Alumni; but, luckily for me, there was a Daily Campus or two lying around and make a make-shift towel. A week or two later, I found out who the leader was and returned the favor AND made sure there was no newspaper, toilet paper, etc. left in the bathroom. He came streaking back into his room, only to learn that I had invited all of the girls on the floor to his room to watch TV.
Same semester, another guy put tabasco sauce in my fruit punch. Ouch! I found out who did it and volunteered to make a Run for the Border one day a few weeks later. He realized to late that the reason his taco was ‘really chewy’ was because I unrolled a lubed, ultrathin Trojan in the middle of it.