Jimulacrum
Full House
So true. Someone could be in there with something as weak as 3s4d5c9s.
Oddly enough, despite my previous post about PLO8, that's a hand I would probably never play outside the blinds in a loose fixed- or spread-limit O8 game. Nit-tight preflop play is the name of the game in these situations. Once you're in, same idea. Keep it tight until you've got a real monster, and then value town.
I used to play at a place up here that had a regular $2/$4 limit O8 game. It was the loosest game I have ever seen. Situations like this one were common and did make it worth playing some high-only hands. You're essentially looking to spike a lock overfull and then harvest an insane amount of bets that are dead or can only win the low. Of course, 89TT isn't quite strong enough for this purpose, hence my recommendation to fold it preflop, but now that we have top set, it's a legit draw.