Forced Marriage, Can't Get Rid of Us

The Gemara (שבת פח, א) relates that when Hashem approached the Jews with the proposition of receiving the Torah, He was rather forceful about it. He suspended a mountain over their heads and asked them if they would accept it; if not, then and there would be their burial.
Why did Hashem choose such an interesting manner to give the Torah to His beloved nation?
Giving the Torah at Mt. Sinai was the wedding day of the Jewish people with Hashem (תענית כו ,ב). The halachah states that a person who forcefully marries a woman is obligated to remain married to her (if she so wishes) and, unlike all other marriages, is never allowed to divorce her. Were he to give her a get, it is invalid.
Hashem foresaw that His "wife-to-be," the Jewish people, just may end up in trouble and warrant a "divorce." This He did not want; so, He "forcefully" married them, thus disabling a divorce forever.
צפנת פענח חדש ערך נשואין וגירושין אופן הא
ועי' בגור אריה שמות יט, יז פי' דומה
ועי' לקוש ח"א שיחה ב' לפ' תצא
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Watch Where You Look

Before receiving the Torah, there were preparatory days wherein the Jews got themselves ready for the holy day. Hashem instructed Moshe to tell the Jews not to ascend the mountain; a boundary was set up which the Jews were not to cross. They were severely warned not to do this. The second time Moshe was preparing to receive the luchos, Hashem gave similar instructions, adding that no person should be present when he was to ascend, and even animal should not graze there.
From Hashem's instructions that upon ascending the mountain the animals should not be around, the Rokeach writes that this hints to the following idea: On the day we initiate a child to learning from the holy Torah, we cover him so he shouldn't see any dogs.
רוקח הל' שבועות ריש סי' רצ"ו
ועי' בלקו"ש חכ"ה ע' 310
See here