Never lost with pocketed quads, but have with a straight flush:
Party Poker 2/4 Hold'em (8 handed)
converter
Preflop: Hero is BB with 9[img]/images/graemlins/heart.gif[/img], 8[img]/images/graemlins/heart.gif[/img].
<font color="#CC3333">UTG raises</font>, <font color="#666666">
6 folds</font>, Hero calls.
Flop: (4.50 SB) J[img]/images/graemlins/heart.gif[/img], T[img]/images/graemlins/heart.gif[/img], A[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(2 players)</font>
Hero checks, <font color="#CC3333">UTG bets</font>, Hero calls.
Turn: (3.25 BB) J[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(2 players)</font>
Hero checks, <font color="#CC3333">UTG bets</font>, <font color="#CC3333">Hero raises</font>, UTG calls.
OK, worried about K[img]/images/graemlins/heart.gif[/img] or Q[img]/images/graemlins/heart.gif[/img] ...
River: (7.25 BB) Q[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(2 players)</font>
One down ...
<font color="#CC3333">Hero bets</font>, <font color="#CC3333">UTG raises</font>, <font color="#CC3333">Hero types "oy" and 3-bets</font>, <font color="#CC3333">UTG caps</font>, Hero calls.
Final Pot: 15.25 BB
Results in white below: <font color="#FFFFFF">
Hero has 9h 8h (straight flush, queen high).
UTG has As Kh (straight flush, ace high).
Outcome: UTG wins 15.25 BB. </font>