"Sometimes" - massive understatement. I went to Montana last week. As per usual I got sent to secondary inspection.
"Sir, I need you to fill in this I-94 form."
(Scribble)
" 'Not staying' is not an acceptable answer to the question asking for your address, you must tell us specifically where you are staying in the US."
"Er, I'm going shopping."
"You must fully answer the question, where are you going in the US."
"Er, I'm going to the mall and the gas station."
"Put down the address of the mall."
So I put down "the mall".
And thus America becomes a safer place.
Steve.