Wikipedia:Don't poke the bear

Does he look like he wants to be poked?
Even the more harmless-looking variety might not appreciate being poked.

Bears are lovely creatures that often hibernate and are, for the most part, non-violent. However, when poked, bears can become quite angry. As such, it's always best not to poke the bear.

Examples of poking

This metaphor could mean more than you intended

Be careful not to imply that a specific individual is a bear. In Russia "bear" may be a compliment, but elsewhere(OED) it can mean a rough or bad-mannered person and "like a bear with a sore head" means very irritable. Using "don't poke the bear" to hint that an editor is over-sensitive on a subject might not be true, and could be construed as a personal attack. You might also offend fellow editors if they think you are accusing them of "bear-baiting" – a bloodsport which involved setting dogs to attack a captive bear.(OED)

Analogous phrases

See also