Am I insane? (89s in huge pot)

[SL__72]

I know posting UTG+1 is pretty dumb, but this was a ridiculously loose table and I was leaving for a movie in like 20 minutes.

I don't have PT and didn't have any notes on anyone at this table so no reads (other then 70% avg. seeing flop)

PokerStars 0.25/0.50 Hold'em (9 handed) converter

Preflop: Hero is UTG+1 with 8[img]/images/graemlins/heart.gif[/img], 9[img]/images/graemlins/heart.gif[/img]. Hero posts a blind of $0.25. MP1 posts a blind of $0.25.
UTG calls, Hero (poster) checks, MP1 (poster) checks, MP2 calls, <font color="#CC3333">MP3 raises</font>, CO calls, Button calls, SB calls, <font color="#666666">1 fold</font>, UTG calls, Hero calls, MP1 calls, MP2 calls.

Flop: (17 SB) 2[img]/images/graemlins/heart.gif[/img], 6[img]/images/graemlins/spade.gif[/img], 8[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(8 players)</font>
SB checks, UTG checks, <font color="#CC3333">Hero bets</font>, MP1 calls, MP2 folds, MP3 calls, CO calls, Button folds, <font color="#CC3333">SB raises</font>, UTG folds, <font color="#CC3333">Hero 3-bets</font>, MP1 calls, MP3 calls $0.25 (All-In), CO folds, <font color="#CC3333">SB caps</font>, Hero calls, MP1 calls.

Turn: (16 BB) 2[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(4 players, 1 all-in)</font>
SB checks, Hero checks, <font color="#CC3333">MP1 bets</font>, SB calls, Hero calls.

River: (19 BB) Q[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(4 players, 1 all-in)</font>
SB checks, Hero checks, MP1 checks.

Final Pot: 19 BB

I wanna wait a bit and see some feedback before I post my thought process during the hand.