[into the fire] See: [OUT OF THE FRYING PAN INTO THE […]

[into the ground] See: [RUN INTO THE GROUND].

[into the hands of] See: [PLAY INTO THE HANDS OF].

[into thin air] {adv. phr.} Without anything left; completely. * /When […]

[INTPFPOTM] "I nominate this post for post of the month"; incredibly […]

[IOH] "I'm outta here"

[IOW] "In other words"

[IPB] Invision Power Board

[IRC] Internet Relay Chat

[Irish] See: [GET ONE'S DANDER UP] or [GET ONE'S IRISH UP].