I don't get a "funny" joke. Can you help me??????????/
Here is the joke:
Tomato in training
Q: What did the sergeant say to the slacker tomato?
A: "You better ketchup!"

I really don't see what they meant. Please explain it to me, don't leave me hanging.
I thank

Question

I don't get a "funny" joke. Can you help me??????????/
Here is the joke:
Tomato in training
Q: What did the sergeant say to the slacker tomato?
A: "You better ketchup!"

I really don't see what they meant. Please explain it to me, don't leave me hanging.
I thank

Answer

People who tell unfunny jokes should be PUNished.

Answer

Ketchup sounds like "catch up", Ketchup is made from tomatoes.
The joke is a kind of word play called a "pun".

Answer

Thank ya! 
I get now! That's an unfunny  joke!

Answer

'Catch up' sounds like ketchup and there's tomatoes in ketchup