@p--and--t , may well that you find this funny. Ask any of our medico members, someone with say a dormant golden staph bug in the leg or any number of circulatory issues / compromised lymphatic system etc., strikes their leg on a towbar and could end up with cellulitis, re-activated staph, DVT, etc. Result could be a systemic infection (sepsis), amputation, death.
Still funny?
My view of towbars is if it doesn't need to be there it shouldn't. So if you have a Hayman Reece hitch, remove the tongue and leave it in your boot.