Lethal Weapon/Funny

""How do I know you're the police?"
 * The exploding toilet.
 * Most of the time that the "1, 2, 3, then go" issue comes up, which becomes a joint Crowning Moment of Heartwarming and Awesome the last time it occurs during the fourth movie.
 * Both the opening of the third movie, and the little bit after the ending credits. Especially the latter.
 * "My mom says cops shoot black people!" Riggs busted up laughing, and it looked to me like Mel Gibson was genuinely laughing, too.
 * Funny Aneurysm Moment?
 * The look on Roger's face when he realizes the commercial Rianne was in is a condom commercial.
 * Followed by that guy who was building Roger's hobby room commenting about how she was so good in the commercial, it made him want to go out and buy rubbers. Riggs barely contains his laughter.
 * When that smug prima donna director fires Rianne on the spot, Riggs convinces him to hire her back at a higher salary by smacking him around like a redheaded stepchild, while passing it all off as an attempt to help the director back to his feet.
 * When Murtaugh pulls his gun on Riggs for interrupting his Drowning My Sorrows moment, Riggs goes and pulls a Daffy Duck by sticking his finger in the barrel of the gun and taking Roger's bottle away. It gets better, as Roger then says "Get your finger out of my bottle and give me back my gun!"
 * And then, once he smacks some sense to Murtaugh... well, see Papa Wolf.
 * Riggs ramming his dislocated shoulder into a wall to re-set it with a massive grimace of pain--six inches in front of his psychologist's face. She just gives him a resigned look.

"After I shoot you through the door, you can examine the bullet! Open up!""

"Murtaugh: This shut ain't funny anymore!"
 * After Riggs and Murtagh are demoted, they have to deal with a jaywalker. Said jaywalker turns out to be a little obnoxious, so Riggs deals with the problem by pretending that they're just gonna kill him.
 * In 4, Riggs keeps hanging the picture of Murtaugh in his underwear. Murtaugh is getting more than furious.

"Riggs: Could we please knock out this shit already? You're captain speaking."
 * After the two were promoted to captain, they see it again.

"Butters: You have the right to an attorney. But if you hire Johnnie Cochran, I'll kill you!"
 * Also in 4, Butters arrests a Chinese person who's at the wrong place at the wrong time.