Easily
these.
Also, if we're talking about robots that sound scary, 5817 and 5012's 2016 robots both had shooters that sounded like leafblowers when they spun up, and 5817's shot looked like it had the potential to mess someone up if it went astray.
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2016:
Team 5940 (Silicon Valley Regional Rookie All-Star and Quarterfinalist, Curie Quarterfinalist)
Volunteer: 2016 (Chezy Champs Field Reset, Capital City Classic FTA, MadTown ThrowDown FTA)