Does “Sé” (“I know”) sound weird without “yo” or “no” before it?

Basically title. I was taught that, while you drop personal pronouns most of the time, you don’t with “sé” (unless it’s “no sé”) because “se” has so many meanings in Spanish. Or maybe it’s because it just sounds weird on its own. Either way, is it true? Does it sound ok to just start a sentence with “sé” without “yo” before it?

In this thread people were using “sé” and the start of the sentence and it caught me off guard. Any insight would be appreciated. Thanks!

submitted by /u/Water-is-h2o
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