You might want to explain the reference in case we didn't all learn the paper by heart...
https://github.com/deepseek-ai/DeepSeek-R1/blob/main/DeepSeek_R1.pdf
Table 3 on page 9. The "Aha" paragraph starts on the page before that.
And yes, I think I tried DeepSeek and it wrote things like that, I'm not sure if "Aha", but similar things. Also "Wait..." and that something didn't look right and it had to backtrack... It generally writes a lot of weird stuff. Sometimes it even writes wrong things and then doesn't listen to itself and it silently corrects itself in the process. Other models phrase things with a different tone. At least that's what I've seen. Some also repeat a lot of stuff. I'll write what I want, and then it goes on and on "the user wants me to ..." and repeats everything once again, just not in first person, but in third person. And then after some nonsense, it tries to dissect the problem.