The Icelandic Experience

It never erupts when you want it to.

The Icelandic Experience is a Steam achievement.

On the east side of Glarblargle Beach is a geyser that periodically erupts. Jump into the waterstream for the achievement.

The waterstream will cease to spray if you attempt to jump straight into it, but if you fall from above (using, for example, the anti-gravity mutation) the water will often spray up as you fall into it.