25nl wtf is this about????

So I was getting really bored at a table and decide to take a maniac bluffcity approach to this hand. this is what ensues and has me stupified!!!!
The hand before I lost a large chuck to this guy when AK found his AA




Stacks:
* Villian with $50.70
* BTN with $60.05
* SB with $14.00
* BB with $25.00
* UTG with $24.25
* MP with $18.80




Blinds: $0.00/$0.00
Site: full tilt poker
* * Dealt to MP:4♦ K♥
Preflop:
* * 1 players fold.
Hero raises to $1
* * Villian calls [$1]
* * 3 players folded.
* * Total folds this street: 4
* * Potsize: $2.35
Flop: 5♥ K♦ 7♥ Hero bets [$2.35]
* * 3 players fold.
* * Villian calls [$2.35]
* * Potsize: $7.05
Turn: 5♦ Hero bets [$15.45, and is all in]
* * Villian calls [$15.45] Hero shows : 4♦ K♥
* * Villian shows : 7♠ 8♠
* * Potsize: $37.95
River: 9♦
* * Hero shows two pair, Kings and Fives
* * Villian shows two pair, Sevens and Fives Hero wins the pot ($36.10) with two pair, Kings and Fives

Obv thought your overbet-shove was trying to buy the pot and that his 7 was good.

"The hand before I lost a large chuck to this guy when AK found his AA"

Obviously thought you where tilt shoving with air.

I posted something similar in the brags and bad beats forum.
A guy protects his $1 investment by putting in $5.75 worth of calls.