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Deus Ex is one of my all time favorite games. Its levels are large and gives lots of room for exploration and experimentation. I have played Deus Ex about seven times through in my life, and even on the seventh play-through I was still finding little details I had not seen before.
However, this kind of open-ended gameplay leaves room for glitches. Lots of them. There are many I could talk about, but my favorite occurs when you trick characters into fighting one another. What this basically involves is shooting a soldier during the early visits to UNATCO, then running away and finding another soldier to hide behind. If you can get the soldiers to shoot each other, all hell breaks loose - and soon the entire UNATCO headquarters is in on it. However, at this early stage in the plot the characters are invulnerable (so you can't break the plot) so no one dies despite being riddled with thousands of bullets. Everyone will eventually run out of bullets and just start knifing each other. Yes, these soldiers can shank with the best of them.
For a particularly fun variation on this glitch, check out the Deus Ex "Things Never Seen" webpage. There are also tons of other Deus Ex glitches listed on this page, so check those out as well.