False friends with Russian, imperative tense "Respect!"
"Careful!" should work too, no?
OK, added now.
"Be careful" for that matter as well...
This one works already.
What about "Attention!"?
Well, as it's a noun, I guess it really should be translated as "Uwaga!" - although I guess they would be used in the same situation.
After a second thought - OK, I guess it can work here as well. Added.
Watch it should be accepted too
I just used careful and it was not accepted
Well, it should have, it's among the accepted answers.
OK, if "Attention!" works... but it's closer to "Uwaga!" (a noun) than "Uważaj!" (a verb).