There has been only one time that I can remember where I flopped top full or top set and lost to four of a kind and that is over ten years of playing so it doesn't happen that often. I have been on the winning side of that situation twice and today was one of those times. I raised preflop with 99 and got 3 callers. Hand as follows

PokerStars Game #876469258: Hold'em Limit ($2/$4) - 2004/11/20 - 13:52:31 (ET)
Table 'Cloanthus' Seat #5 is the button
Seat 1: Lucky00721 ($92 in chips)
Seat 2: John_Galt ($70 in chips)
Seat 3: dafuzball ($67 in chips)
Seat 4: STUFTHATWORK ($53 in chips)
Seat 5: Willy K ($147 in chips)
Seat 6: BIG FISH ($207 in chips)
Seat 8: BlueBone ($129 in chips)
Seat 9: Aletheia ($127 in chips)
Seat 10: tenpin299 ($104.50 in chips)
BIG FISH: posts small blind $1
BlueBone: posts big blind $2
*** HOLE CARDS ***
Dealt to John_Galt [9d 9s]
Aletheia: folds
tenpin299: folds
Lucky00721: folds
John_Galt: raises $2 to $4
dafuzball: calls $4
STUFTHATWORK: calls $4
Willy K: folds
BIG FISH: folds
BlueBone: calls $2
*** FLOP *** [9c Qc 4d]
BlueBone: checks
John_Galt: bets $2
dafuzball: raises $2 to $4
STUFTHATWORK: folds
BlueBone: calls $4
John_Galt: raises $2 to $6
dafuzball: calls $2
BlueBone: calls $2
*** TURN *** [9c Qc 4d]
BlueBone: checks
John_Galt: bets $4
roth77 joins the table at seat #7
dafuzball: calls $4
BlueBone: calls $4 I think he makes a horrible play here by just calling my bet.
*** RIVER *** [9c Qc 4d Jh] Well I am thinking to myself this is overkill but hey I'll take it

BlueBone: checks
John_Galt: bets $4
dafuzball: calls $4
BlueBone: raises $4 to $8
John_Galt: raises $4 to $12
dafuzball: folds
BlueBone: raises $4 to $16
Betting is capped
John_Galt: calls $4
*** SHOW DOWN ***
BlueBone: shows [Qd Qs] (a full house, Queens full of Nines)

tough break bro

John_Galt: shows [9d 9s] (four of a kind, Nines)
John_Galt collected $80 from pot
*** SUMMARY ***
Total pot $83 | Rake $3
Board [9c Qc 4d Jh 9h]
Seat 1: Lucky00721 folded before Flop (didn't bet)
Seat 2: John_Galt showed [9d 9s] and won ($80) with four of a kind, Nines
Seat 3: dafuzball folded on the River
Seat 4: STUFTHATWORK folded on the Flop
Seat 5: Willy K (button) folded before Flop (didn't bet)
Seat 6: BIG FISH (small blind) folded before Flop
Seat 8: BlueBone (big blind) showed [Qd Qs] and lost with a full house, Queens full of Nines
Seat 9: Aletheia folded before Flop (didn't bet)
Seat 10: tenpin299 folded before Flop (didn't bet)

Fantastic feeling, ain't it!
The most memorable one I had was a losing one.
Against a TOTAL maniac I had 9,9
Flop was 6,9,6.
He being a total maniac and all, previously capping many times w/ absolutely nothin!
He and I both were more than glad to cap all four rounds.
Showdown he shows 6,6 ! !#$%!$&^%