The trick is to make it bigger on the inside than it is on the outside. I use a low budget TARDIS every time I drink too much and de-materialize then re-materialize in a new location a great distance away during a completely different time period (often hours into the future). Oddly I can never find the keys while I'm sober so I've not had the opportunity to use this incredible device for good, only evil. I'll try to remember to snap some pictures the next time I drink an inhuman amount of whiskey, although they may be used against me in court so probably not a good idea. You understand I'm sure.