Here's a few things that have happened to me over the past 10 years:

Partial Power loss in a single engine Cessna in the pattern. Ended up making it back to land. Cause: Bad fuel

Total electrical failure, IMC, at night in a single engine Piper. Flew partial panel for about 75 miles to VFR weather, and talked with ATC via a phone patch through FSS on my cellphone. Cause- alternator bearings came apart inflight.

False cargo fire shortly after departure in the CRJ. Blew the bottles, came back around and landed uneventfully.

3 Medical emergencies requiring special handling. (Heart attack, stroke, severe anxiety resulting in the passenger going crazy and trying to open the overwing exit)

Multiple EFIS tube failures (including 2 out of 3 on one flight)

But the scariest of them all was the night when right after takeoff on a redeye flight across the country (flying charter), the coffee maker broke!