Mine was very simple and stupid.

Grade 8 we played truth or dare somehow and the only dare I got was to kiss the girl I had small crush on. Of course I made a big deal about it, feigning reluctantness beforehand and embarrassment afterwards. A quick peck on the cheek did it. Then the guys afterwards were all like "oh come on, you wanted to kiss her anyways." That's it >.>

I remember I was in kindergarten, and this boy was in second grade. We were on the bus and decided that we were "dating" and that we wanted to "French kiss". So, I put up my umbrella and Voila! We kissed on the lips.