Most dumbest thing about the E.T. movie

Spielberg replaced the guns with walkie talkies in later releases.

Your teacher should have taught you about "double superlatives". But since he/she obviously didn't, here it is:

In English grammar, the double superlative is the use of both most and the suffix -est to indicate the superlative form of an adjective (for example, "my most biggest fear" and "the most unfriendliest teacher").

It's a mistake.

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I don't think the government was going to actually use the guns, and in these movies the kids always overpower the adults. I'm guessing you had a problem with Home Alone as well.

Not sure if you are trying to be funny or not. You really think the government are going to shoot the kids off their bikes? Do you think these officials would even be morally capable of doing that?