Was flying a tiny budget airline (I think it was Western Pacific) from TYS to SFO, (which actually was Knoxville> Atlanta > Denver> SFO). I booked months out then never bothered to go back and confirm the flight times, etc. Arrived in Denver at 11pm only to find out the flight on to SFO had been cancelled weeks ago, and there weren't anymore. My bags had randomly been sent on to somewhere on the east coast.

Does not calling or going online to confirm my flights before leaving count as a dumb mistake? Because it definitely felt like it.