I don't know about rap music,
but the most amusing metaphor I've read this week comes from the World Gold Council, via a Portuguese news website:

The WGC stresses the obvious point that money (euros) “is abstract – numbers on a computer screen. By contrast, gold is concrete.”

It's got all the charm of a mixed metaphor, except it isn't mixed.
( Moon Girl Technologies horrendous beanbag, Sat 5 Jan 2013, 17:52, archived)

So before computers there was no money?

( BraynDedd Natasha Kaplinsky's labia majora, Sat 5 Jan 2013, 17:55, archived)

Yes but then it was just numbers in an account book.

( Moon Girl Technologies horrendous beanbag, Sat 5 Jan 2013, 17:56, archived)

There's nothing worse than improperly mixed concrete

( drimble he'd been white, he'd been black, Sat 5 Jan 2013, 17:56, archived)

I dunno being eaten by a shark sounds pretty bad

( Moon Girl Technologies horrendous beanbag, Sat 5 Jan 2013, 18:02, archived)

Have you been sending Gonz icebreakers?

( hartley hare Just some prick who thinks it doesn't apply to him, Sat 5 Jan 2013, 18:04, archived)

might send him a croc clip muffin

( Moon Girl Technologies horrendous beanbag, Sat 5 Jan 2013, 18:05, archived)

and a juicer
www.b3ta.com/questions/offtopic/post1822232
( hartley hare Just some prick who thinks it doesn't apply to him, Sat 5 Jan 2013, 18:07, archived)

oh I thought you meant the sort of ship,
I've never heard it used in that context before. I've heard of breaking the ice at parties, thanks to Monty Python.
( Moon Girl Technologies horrendous beanbag, Sat 5 Jan 2013, 18:09, archived)

Yep "Tis a flesh wound"
always goes down well at a party when showing of your gash
( hartley hare Just some prick who thinks it doesn't apply to him, Sat 5 Jan 2013, 18:11, archived)

I don't go to that kind of party.

( Moon Girl Technologies horrendous beanbag, Sat 5 Jan 2013, 18:12, archived)

*Retrieves car keys from the bowl*

( hartley hare Just some prick who thinks it doesn't apply to him, Sat 5 Jan 2013, 18:13, archived)

One could lead to the other, you could be walking along the seafront minding your own business
and then you catch your foot in the flaking concrete path and trip over the wall, falling straight into the mouth of the shark waiting below
( drimble he'd been white, he'd been black, Sat 5 Jan 2013, 18:08, archived)

true, true,
then again you could get eaten by a shark just before you were about to finish mixing some concrete, and then the concrete wouldn't get mixed properly.
( Moon Girl Technologies horrendous beanbag, Sat 5 Jan 2013, 18:11, archived)

The number of times workmen have been to repair that path, and it always ends the same way :(

( drimble he'd been white, he'd been black, Sat 5 Jan 2013, 18:15, archived)