A mere pup Bose-X me ole....
Ok, slight wind up aside, xponder usage and in particular the requirement to squark Mode C (if fitted) has featured in quite a few industry safety awareness publications for quite some time now yet many PPL holders can't even be bothered to switch the thing to standby and we all know why - they have this ridiculous mistaken idea that if they bust controlled airspace they won't be caught if their xponder is switched off.
VFE.