My favorite would be my 1996 Chevy Blazer (got it at 15 in 2001)
Loved that vehicle...
Not only was it my first vehicle, but the first vehicle I:
*Modded (lifted, tires, rims, headers, chipped, etc)
*Got laid for the first time in
*Got my first bj in
*Got on my most recent ex for the first time in
*and countless other things...