Probably call - if anything, the 8 made it a little harder for me because I was worried he might have accidentally hit a runner-runner straight on me. I figured his range was any two, pretty much, so a hand with a 9 in it was certainly not out of the question. But I also figured he would push that river card after all the prior action, no matter what he had. I suspect that the main reason he pushed the river (besides my seeming passivity) was that it was a good bluff card. If it had been a blank, I think he might have made a smaller donk bet - which I could have called without worrying too much about it - or maybe even checked. That was my feeling during the hand anyway.