Here's a recent doozie... I just realized, one day too late, that my frequent-flyer 'air miles' with American Airlines are seriously about to expire. I don't have a lot compared to business travellers, but I had been cultivating them half-heartedly with some major trips.
Yesterday, they expired. I think all I had to do was buy some via the website.
I'm fairly unhappy about this development, as it could have been avoided.
Ah well. Chalk it up to being eccentric.
ps. I guess I should login to Air Canada and see what they have to say.