A close look at the Hebrew text of Exodus 20, the account of the giving of the Torah to the children of Israel raises some interesting questions. Most English translations of Exodus 20:18 say that the people of Israel witnessed thunder and lighting as God gave His Torah, the 10 Commandments. However, the Hebrew actually says that the people of Israel saw voices and fire (plural) and the sound of the shofar:
כָל-הָעָם רֹאִים אֶת-הַקּוֹלֹת וְאֶת-הַלַּפִּידִם, וְאֵת קוֹל הַשֹּׁפָר
This begs the question, how does one see voices? And why are the voices and fires in plural?