I remember the first game drive I went on. I had just arrived at Londolozi and after a quick bite to eat and shower I was put in one of the trucks. We stopped on a road and a leopard was talking towards us and came on my side of the truck and basically brushed against it walking past. I was so nervous and holding my breath I was afraid to even take a photo.
After a few more drives/days you see what it is like and loosen up a bit more. The only time I got a little nervous was when we were in sort of this shallow bowl with a few ornery elephants who were making some motions towards the truck.