A joke about flying

In a plane:  (The format really depends on whether you're writing this in a dramatic format or as prose. In plays, the scene is usually italicized) 
(Captain) CAPTAIN: Good morning, ladies and gentlemen. This is your captain. We are currently approaching.....OH MY GOD!!!
The passengers hear a loud scream, followed by a infernal noise.
(Captain) - CAPTAIN: Nooooooooooooo!!!!!!
(Captain) -  CAPTAIN: Fuck, shit,

crackkkkkkkkkkkkkk, booooom......... (I presume the captain is not saying this. So it reallly should be separated. Maybe preceded with 'There is a loud...')
And then a silence that seems to be eternal. (or last for ever)
A few seconds after, the captain takes again the microphone and laughing, he apologizes:
- CAPTAIN: I beg your pardon, ladies and gentlemen. I have thrown away by mistake the tray and I spilt my cup of coffee on my trousers and ............it's better for you not to know how my the of my front trousers are now.....

One of the passengers cries: Stupid!!! You should have to see how my the back of my trousers are!!!!!!!!

A joke about flying

In a plane:
(Captain) -Good morning, ladies and gentlemen. This is your captain. We are currently approaching.....OH MY GOD!!!
The passengers hear a loud scream, followed by an infernal noise.
(Captain) - Nooooooooooooo!!!!!!
(Captain) -Fuck, shit, crackkkkkkkkkkkkkk, booooom.........
And then a silence that seems to be eternal.
A few seconds later after, the captain takes again the microphone again, and laughing, he apologizes:
-I beg your pardon, ladies and gentlemen. I have thrown away by mistake upset my the tray and I spilled my cup of coffee on my trousers and ............it's better for you not to know how the front of my front trousers are now.....

One of the passengers cries:
-Stupid!!! You should have to see how my the back of my trousers are!!!!!!!!

[Funny!  It actually helps the joke that you use the word "trousers" instead of "pants".  The word "trousers" is a little old fashioned and formal, and in normal conversation you would say "pants".  The punch line of the joke works better because it is the trousers that have been soiled.] 

A joke about flying

In a plane:
(Captain) -Good morning, ladies and gentlemen. This is your captain. We are currently approaching.....OH MY GOD!!!
The passengers hear a loud scream, followed by a infernal noise.
(Captain) - Nooooooooooooo!!!!!!
(Captain) -Fuck, shit, crackkkkkkkkkkkkkk, booooom.........
And then a silence that seems to be eternal.
A few seconds after, the captain picks up the microphone again and laughing, he apologizes:
-I beg your pardon, ladies and gentlemen. I mistakenly threw away the tray and I spilled my coffee on my trousers and ............it's better for you not to know how the front of my trousers are now.....

One of the passengers cries:
-Stupid!!! You should  see how the  back of my trousers are!!!!!!!!

A joke about flying

In a plane:
(Captain) -Good morning, ladies and gentlemen. This is your captain. We are currently approaching.....OH MY GOD!!!
The passengers hear a loud scream, followed by a infernal noise.
(Captain) - Nooooooooooooo!!!!!!
(Captain) -Fuck, shit, crackkkkkkkkkkkkkk, booooom.........
And then a silence that seems to be eternal.
A few seconds after, the captain takes again the microphone the microphone again, and laughing, he apologizes:
-I beg your pardon, ladies and gentlemen. I have thrown my tray away by mistake the tray and I spilt spilled my cup of coffee on my trousers and ............it's better for you not to know how my front trousers are now.....

One of the passengers cries:
-Stupid!!! You should have to see how the back of my back trousers are!!!!!!!!

Good work. I laughed. Your only problem was word order, which is kind of tricky. In English the object does go toward the end of the sentence, but it also goes before adverbs that qualify the action of the main verb, as in the two sentences I corrected.