I've had a few:

1996 - HYA-ACK. Just the pilot, me and my pal, with about 15 bicycles for the 15 min hop over nantucket sound. I sat in the co-pilot seat of the cessna 402 (as I always tried to do on those Island Air flights).

1999 LHR-EDI. Myself and a colleague seemed to be the only two pax in the back of a 767 on the shuttle run. We had flown in from SFO and been assigned seats together, but quickly spread out. Due to the vast amounts of booze we had consumed on the earlier leg, I can't really remember the details, but we must have done something right as we both staggered of with duty free bags full of minatures and mixers provided by the stewies ^

2001 LDY-DUB. Just two pax on this BA/Loganair flight early on an Easter Monday morning. A Saab 340 (I think)

2001(?) BFS-SNN - 25 people on an EI MD-11 for the first leg of a hop to the US. All stayed on except for me and The Current Mrs. Bounty, who had hitched a ride with an obliging relative who crewed for EI to get to an Irish coffee festival in Co. Limerick. Getting back was a right pain in the posterior though....

2003 EDI-DUB - EI had laid on some extra flights to bring Irish revellers over to the Edinburgh Hogmany (New Years Eve) celebrations (which actually ended up being cancelled due to some extremely inclement weather). As usual, they had forgetten to advertise the flights in the UK, so we were able to pick up a last minute deal for something like £9 each way. So myself, TCMB and Bounty Jnr flew over for New Years in Dublin with less than 30 other people on a 737.

(whew, my longest ever post on FT!)