I've seen this happen at LAX before, so it's obviously not a one-time situation that can be blamed on computers going down or some such nonsense. The last time it happened to me, I thought it was funny when a girl emerged from the back and screamed out, "Is everyone okay with a pickup truck?" 95% of the people were so anxious to get out of there that they grabbed keys and rental contracts like mad. I actually had to drive three other coworkers so I needed something with more cabin space. After patiently waiting for all the pickups to leave, and explaining why I couldn't take one, my midsize reservation netted me a brand new Grand Marquis!
But I would have preferred a non-upgraded Fusion or whatever to have found my name on the board and been on my way in seconds rather than almost an hour.