I am sorely tempted to nip back down and see if Pikachu is still around for a second visit. Would that be obsessive? 
I also managed to catch a couple of Abras during tonight's walk, but also had another couple go poof, which is incredibly annoying. That's about six in total which have poofed over the last week or so. However, I now only need 9 candies for my Alakazam, but could do with catching one with a high enough CP to be worth evolving, a couple of the previous ones which went poof were about 500 or 600 CP, so once I've got the candies I'll hang fire on evolving until I've caught one of those.
As things stand, I'll be able to add another 10 as well as Alakazam at my next lucky egg evolving session, and it may even be more if I walk another buddy for candies whilst waiting to catch a decent Abra. :)