Jumping Cabbages

Today, as I was walking by the cabbage farm south of Falador, I saw the last thing you would expect to see in RuneScape (or anyplace for that matter): Jumping cabbages. And that's not all. When you kick, tap or try to pick them, they talk as well. Thinking they were special, I tried to pick one. I couldn't. I asked someone nearby how'd he got his cabbage he was wielding. He brought me to a cabbage that was no different to the others - except that instead of having a tap/kick or pick option, it had a catch option. This time, I got the cabbage. I tried eating one of but the same quote appeared - You eat the cabbage. Yuck!. There doesn't seem to be anything special about them, but I'm keeping 3 in my bank just in case...