Well it wasn't for fun, but while flying with my old instructor a
couple years ago on a night x-country he suddenly grabbed the controls
from me, rolled into a 45 degree bank, and pushed the nose down HARD to
avoid what appeared to be an imminent head-on mid-air. Definitely took
a flight within the plane for a couple of seconds during that maneuver,
but we cleared the traffic with no problem. (It probably wasn't all
that close actually, but when you see red on right, a white light, and
no movement, you get the hell outta the way).

--
Guy Elden Jr.