Picking up an item while inventory is full repeatedly produces makes the item move indefinitely.

[TadaCZE]

Or, simply put, it makes the item go weeeeeeeeeeeeeeeeeeee right up.

This is an issue only with the animation - purely visual. It doesn't actually change the item's position. To reproduce, you just have to have a full inventory and repeatedly try to pick up the same item.

[TheShadowOfHassen]

I can confirm that it happens. But I kind of enjoy it going Wheeeeeeee! All the way up to the top of the map.

I think if @00-Evan keeps it around he should add an achievement if you get it up far enough.

[00-Evan]

This is intended actually, see: #1540, #1468, #1436, #1355, #1150, #1073, #689, #640, #203, #40