Good thread this, as a pax I can say I get very frustrated with dim people on planes. On a Virgin flight out of LHR there was an Indian lady who didn't speak much English, she had her kid with her who spoke no English at all - I'd reckon he would be about 3-4 years old. During taxiing to departure the kid would not stay in his seatbelt, and despite several warnings from the CC that the plane wouldn't depart it took off with the kid standing on his seat screaming his head off. Credit to the CC for staying patient, luckily the kid fell asleep for the rest of the journey.
Oh and to the CC who forgot the key for the portable DVD player when the entertainment system in my wifes seat went SNAFU, it was a blessing in disguise as we got a very nice voucher. Although swapping seats meant I had to sit next to the drunk comatose old lady who farted all the way over the Atlantic :-(