You're thinking of chlorine trifluoride [1]. But red fuming nitric acid is also hypergolic with many fuels.

[1] https://www.science.org/content/blog-post/sand-won-t-save-yo...

It's... a little spicy sure, and yeah maybe the acid burns and NO2 exposure are a bit lethal.

But my god man, think of the specific impulse! ;)

Not quite, it contains a little bit of water and will be fine sitting on a bench in an open beaker. But you should really avoid touching it or having it touch anything, particularly anything with carbon in it.