ROFL I think I know when I''m using UDP and TCP thanks very much

You could get merged packets, if as someone said above the routers (or the subsystems on the sending computer) had a bug causing them to write out invalid headers so that the length and possibly fragment data became corrupted. However i would see this as a very very rare and unfortunate occurence.
And as for getting duplicate packets when using higher level protocols, thats the higher level protocols sending duplicate packets...not UDP sending duplicate packets

I do not believe that RFC specifications allows for "merged" UDP packets.

Your drivers or networking hardware are probably non-RFC compliant. Having code to handle "merged" UDP packets is ridiculous IMHO.

In ANY circumstances, UDP will never be merged. Its datagram based, not stream based.

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Thanks for all the interesting replies!