Eww. You could get mice living in there.

On a positive note, I expected we would see the first cell phone with a plastic peel-off saying "BUILT IN SUBWOOFER".

Fortunately I seem to have been wrong.

M60ti, VP180, QS8, M2ti, EP500, PC-Plus 20-39
M5HP, M40ti, Sierra-1
LFR1100 active, ADA1500-4 and -8