From a session just now:

No-Limit Hold'em, $1.00 BB (6 handed) - Hold'em Manager Converter Tool from FlopTurnRiver.com

UTG ($100)
MP ($98)
CO ($140.42)
Button ($87.50)
SB ($101)
Hero (BB) ($96.50)

Preflop: Hero is BB with 4, 8
2 folds, CO calls $1, 2 folds, Hero checks

Flop: ($2.50) 5, J, 7 (2 players)
Hero checks, CO checks

Turn: ($2.50) 8 (2 players)
Hero checks, CO checks

River: ($2.50) 4 (2 players)
Hero checks, CO bets $2.50, Hero calls $2.50

Total pot: $7.50

Results:
Hero had 4, 8 (two pair, eights and fours).
CO had Q, 10 (high card, Queen).
Outcome: Hero won $7.15

Lots of people go "Whee 2P and he might not have a flush so I bet!" but seriously, wtf hands would really call me here that dont beat me? His air folds, and unless I minbet no one pair hands call, and theres not many 1P hands that got here like this. I have a bluff catcher, but not a value betting hand.

Warning!!: This call is only good because this particular opponent likes to bluff rivers a lot, and even then its pretty marginal.