1978 Chrysler Lebaron, Some time in the late 1980's, On Roosevelt Boulevard in Philly, very late at night. Took a while to get up there, front end started swimming around, needle pointing down at the odometer. Amazed I didn't die in a horrible crash.
A rear or two later, I-95, also in Philly, just north of the Ben Franklin Bridge, on a 1978 Honda CB550k. Talk about squirrely!
And finally in a 1992 Subaru Loyale somewhere in the middle of the country during my migration west, in 1993.
None of those are really vehicles you think about hitting the century mark, but I did it. Not too interested in doing it any more.