Some years ago ferrying an R44 with 2 pax from a smaller airfield to a bigger one about 20 minutes away. The 2 pax had come along to look at trial flights and possible training, and were invited along on the ferry flight.
Despite a proper brief, just after I lifted and moved a few feet forwards the collective felt "odd". One of those "that's not right?" moments, so straight back on the ground it was. On looking at the pax seatbelt it was routed over the top of the collective, not under, hence the restriction - I looked much more carefully at seatbelts after that.