I went to several different Proms in 1967, 68, and 69.
In 1968 (the year I graduated) since my Dad managed a New Car dealer, he brought home my favorite car to use for Prom night. A brand new, 68 red on red 390 AMX. (what else?!!??). Looked just like this one.
1968 AMC AMX Pictures
Spent very little time at the prom, had a quick dinner, and spent the rest of the night cruisin in the X.
Never saw the girl again, but the car made quite an impression on me, and one and half years later I ordered a brand new AMX. Still have that car.