Call this turn, yey or ney.

[Xaston]

***** Hand History for Game 2804114024 *****
$10/$20 Texas Hold'em - Friday, September 30, 23:21:39 EDT 2005
Table Table 11340 (6 max) (Real Money)
Seat 1 is the button
Total number of players : 6
Seat 6: I make questionable turn calls ( $488.50 )
Seat 3: Am I sitting out? ( $671.50 )
Seat 4: BB ( $321 )
Seat 5: UTG ( $200 )
Seat 1: What's this little white puck mean? ( $157 )
Seat 2: SB ( $316 )
SB posts small blind [$5].
BB posts big blind [$10].
** Dealing down cards **
Dealt to I make questionable turn calls [ Kc Ks ]
UTG folds.
I make questionable turn calls raises [$20].
What's this little white puck mean? calls [$20].
SB calls [$15].
BB calls [$10].
** Dealing Flop ** [ Th, 6d, 4h ]
SB checks.
BB checks.
I make questionable turn calls bets [$10].
What's this little white puck mean? calls [$10].
SB calls [$10].
BB calls [$10].
** Dealing Turn ** [ Ah ]
SB checks.
BB checks.
I make questionable turn calls checks.
What's this little white puck mean? bets [$20].
SB calls [$20].
BB folds.
I make questionable turn calls calls [$20].
** Dealing River ** [ 2c ]
SB checks.
I make questionable turn calls checks.
What's this little white puck mean? checks.
SB shows [ 8d, 5d ] high card ace.
I make questionable turn calls shows [ Kc, Ks ] a pair of kings.
What's this little white puck mean? doesn't show [ Kh, Td ] a pair of tens.
I make questionable turn calls wins $178 from the main pot with a pair of kings.

[EscapePlan9]

As usual, read dependant for the most part. Against unknowns and the action so far, I would call this turn. He probably knows that turn is a scary card (overcard and flush possibility) and went to take down the pot there when everyone checked. He could be completely bluffing or semi-bluffing (flush draw).

[MecosKing]