Zigzag Lava Bubble
From the Super Mario Wiki
Zigzag Lava Bubbles are Lava Bubbles that are first found in Super Mario World. Unlike regular Lava Bubbles, Zigzag Lava Bubbles are never found in lava; instead, they are always in the air they bounce off any walls they run into in an attempt to hurt Mario or Luigi. They are only found in certain castle levels. One also appears in Lemmy's boss fight, and two others also assist Wendy. When a Zigzag Lava Bubble falls in the lava, they never come back out.