Think this is a record as far as my experience goes

5 people all-in in the first 2 hands. Of course, the river was absolutely brutal for someone both times.

1st hand:
FUN4ME - Calls $20
TOMMYSTOTER - Calls $20
DRUMLORD - Raises $80 to $80
TOTALLYME - Folds
MOEFOE - Calls $80
ELCONN - Calls $80
IVEY2186 - Calls $80
ARKYV - Folds
CHUCKIT - Calls $60
FUN4ME - All-In(Raise) $1480 to $1500
TOMMYSTOTER - Folds
DRUMLORD - Folds
MOEFOE - Folds
ELCONN - All-In $1420
IVEY2186 - Folds
CHUCKIT - Folds
*** FLOP *** [10d 3c 4c]
*** TURN *** [10d 3c 4c] [Jc]
*** RIVER *** [10d 3c 4c Jc] [Qs]
*** SHOW DOWN ***
FUN4ME - Shows [Ad Kc] (Straight, ten to ace)
ELCONN - Shows [Jd Jh] (Three of a kind, jacks)
FUN4ME Collects $3350 from main pot

2nd hand:
TOMMYSTOTER - Calls $20
DRUMLORD - Folds
TOTALLYME - Raises $120 to $120
MOEFOE - Folds
IVEY2186 - Calls $120
ARKYV - Folds
CHUCKIT - Calls $110
FUN4ME - Folds
TOMMYSTOTER - Folds
*** FLOP *** [9d Qh 6c]
CHUCKIT - Checks
TOTALLYME - Bets $100
IVEY2186 - Raises $340 to $340
CHUCKIT - Calls $340
TOTALLYME - All-In(Raise) $1280 to $1380
IVEY2186 - All-In $960
CHUCKIT - All-In $960
TOTALLYME - returned ($80) : not called
*** TURN *** [9d Qh 6c] [5h]
*** RIVER *** [9d Qh 6c 5h] [Kd]
*** SHOW DOWN ***
IVEY2186 - Shows [Jc Qd] (One pair, queens)
CHUCKIT - Shows [Kh Qs] (Two Pairs, kings and queens)
TOTALLYME - Shows [Ac Ah] (One pair, aces)
CHUCKIT Collects $4300 from main pot