3 year old DS saying disturbing things

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My 3 year old started talking at a very young age (found a letter from a paediatrician stating he was able to put 5-6 words together in a sentence that was in context he was 18 months old at the time)

I don't know how relevant that is but just wanted to set the scene for the level of speech I'm talking about!

So, over the past few weeks, my DS has been coming out with some very disturbing things and I just don't know where it's coming from, or how to deal with it. A few examples......

2 weeks ago we were watching 'Pip Ahoy' and the seagull was being a bit naughty, flying around. My DS says 'I'm going to rip his wings off so he can't fly'

He frequently says 'I don't like X, he's rubbish so I'm going to put him in the bin'

Yesterday he said he was going to 'push me backwards then kick' me as I wouldn't put his shoes back on he'd taken them off in the car and I couldn't reach to put them back on he also said, earlier in the day, that he was going to 'smash nana up' because we were having a race to the toilet but she got there first.

He's currently watching Blaze whilst I tidy the front room and he just shouted 'You do that again I'm going to punch you really hard' to Crusha, the obligatory naughty character. WTF?

He most certainly doesn't hear it from me or OH (I grew up in a violent home so am very mindful of what comes out in front of him, plus neither of us have violent tendencies). I was speaking to OH about it last night and he's convinced he's getting it from nursery. He was moved up with the 4/5 year olds just prior to his 3rd birthday as he was getting very frustrated in the toddler room because his communication level is so advanced so maybe he's hearing it from them during play?

I'm starting to convince myself that he's going to be a feature on the crime and investigation network in 20 years as a killer that could have been avoided because the warning signs were there from a young age!!!!

How can I deal with this??

Thank you all for taking the time to answer, you have put my mind at rest I no longer believe my DS is going to be the main feature on 'killer kids' on the crime and investigation network and realise he is entirely nuts normal!!

I had a 'threat' today...'if you don't leave my room I'm going to go to bed.....ON MY OWN!!' Bugger me, if I'd known it was that easy I would stand in his room all night!! And he ALWAYS goes to bed on his own

We had a lot.of throw you in the bin type comments from DS at this age (some directed at his baby sister which did worry me a bit). Shooting with his fingers too. He had never been exposed to violence or talk of that kind at home, I think he just picked it up at preschool and was experimenting with language a bit and maybe expressing a bit of frustration about having a baby around. He never did anything violent at ALL and grew out of it within a few months.

Agree nothing to be worried about. My DS is 3 and in the pre-school at nursery (at ours they have 0-3s upstairs and 3-5s in preschool downstairs, think it's fairly normal for 3 year olds to mix with 4 and 5 year olds?? ) and all the boys are obsessed with Spiderman, Batman and Ninja Turtles. My DS goes on and on about Ninja Turtles but he's never seen it and has no concept of what a ninja actually is!! All these characters catch baddies in various ways so the kids just replicate it without properly understanding what they're saying or doing. Agree with OP that it's actually quite sweet that the worst thing they can think of to do to someone who is annoying them is to put them in the bin!

My two (3&5) told me they were going to cut off my head and chop me into pieces this morning. Then bury me. I only asked them to put shoes on.