No, it's not foo-for-all, though it doesn't usually result in explosions.
Unpredictable behaviour is the most likely outcome. And the
unpredictability can show up on outputs that would not normally be
conditional on the floating inputs.

Reg Neale

>I seem to recall breadboarding a CMOS chip once, and in my enthusiasm to
>try the thing, I powered it up without tying down the spare inputs.  Chip
>exploded, (post mortem indicated it was wired correctly).  Previous to
>this experience, I had thought that the precaution to tie down stray
>inputs was foo-for-all.  Could this happen w/ the mclr pin which can't
>be configured as output??
>
>tnx
>bcs