I've seen a lot of overreaching NDAs. Usually a bad combination of an overzealous lawyer who's looking to cover every possible downside and someone in-house who's inflexible and 'just needs this signed'.
Once, a client refused to budge and owed myself and a colleague a total of $70k in back fees by then. The terms of the NDA were ridiculous to the point of being unenforceable, including IP rights to anything produced by my kids and grand kids.
So we just made pen and ink changes to anything we disagreed with (nearly everything) and then signed it. The admin nitwit was able to check their box and we weren't raped on the NDA.
Obviously and intelligent conversation and some reasonable terms would be nice, but I thought our workaround may provide some entertainment...