Sometimes a pot size raise isn't enough... how about 8x pot

Poker Stars, $0.50/$1 NL Hold'em Cash Game, 8 Players
BTN: $59.75 (59.8 bb)
SB: $28 (28 bb)
Hero (BB): $229.40 (229.4 bb)
UTG+1: $118.35 (118.4 bb)
MP1: $21.40 (21.4 bb)
MP2: $157.35 (157.4 bb)
MP3: $94.50 (94.5 bb)
CO: $100 (100 bb)

Pre-Flop: Hero is BB with Js 4h
UTG+1 calls $1, 6 folds, Hero checks

Flop: ($2.50) 2h 3h 5h (2 players)
Hero bets $1.50, UTG+1 raises to $3, Hero calls $1.50

Turn: ($8.50) Jh (2 players)
Hero checks, UTG+1 checks

River: ($8.50) Ah (2 players)
Hero checks, UTG+1 bets $5, Hero raises to $225.40 and is all-in, UTG+1 calls $109.35 and is all-in

Results: $237.20 pot ($3 rake)
Hero showed Js 4h (a straight flush, Ace to Five) and won $234.20 ($115.85 net)
UTG+1 mucked Th 9h (a flush, Ace high) and lost (-$118.35 net)

Note that villain was a donkey (something like 35/15 iirc). I probably should have open shoved river, but I think the c/r looks even more bluffy. I can't believe how light he called me down. After he started timebanking, I thought he was going to fold the Qh. When he called I expected to see Kh... not the ten high flush, hah.