If a polar bear get angry and stands on two legs and you are in survival mode and at the same time you switch to creative mode. So will the polar bear walk around on two legs until you switch to survival.
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Duplicate of MC-102085. Please search before reporting.
Can confirm in Minecraft 16w20a.
Xisumavoid made a video about this as well:
https://youtu.be/5o9mhkVgBgY?t=8m20s