Everyone should experience this at least once - it’s eye opening.

I did it involuntarily because I forgot my wallet once, and decided “well, I’ll either get through and in my way, or I’m too late to drive home anyway and will miss” - and it worked fine.

Even crossed back into the USA without my passport a few times. Just additional screening and bitching is all (at least if you’re a US citizen; membership in the Empire has its perks!).