Either of all time or recently, what is the most funny gag you have read in a manga.
Today it was a kid who was trying to cook for a friend put a whole cabbage in the microwave rather than boil it to preserve the nutrition. Later on his older brother found it and was like "WTF why is there a cabbage in the microwave" For some reason that was really funny to me.

Check this thread: http://www.mangaupdates.com/showtopic.php?tid=8443&page=5#post338465

Ought to be what your hoping to acheive with this thread.