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Of course it's allowed, but only if you punctuate it correctly! The mark you want to use is known as an interrobang.

**Say what‽**

Yes that's right, there are more punctuation marks available than they teach you in grade school.

Shady Characters has a great [pair of blog posts](https://shadycharacters.co.uk/series/the-interrobang/) on the history and usage of the interrobang. Thankfully with its place in the Unicode spec secure and many fonts doing a better job of covering wider ranges of glyphs in recent years it has become much more widely available than it was in centuries past.

Use it with discretion. It's easy to over use, but sometimes it's just the _right_ tool for the job.