I've seen worse, much much worse !
Went to test the cabling left behind by one tenant when they vacated an office, only found 2 pairs connected but on some it was 12&45, others it was 36&78 (or something like that), but also with pairs swapped so 36&78 might appear on 12&45 on the other end. Plus a few where there was nothing connected according to the tester.
Story was that the previous tenant (also a client of ours) had several offices, when they left, they had their electrician separate the networks so each was separate. No offence intended, but like previous criticism of plumbers and alarm installers, "a few" electricians really shouldn't be let loose with network cabling - especially if they aren't prepared to invest in at least the most basic of test equipment.
So, anyone like to guess what was wrong ?