I keep a pair in my saddle bag for any mid-ride chain issues (have had to put a chain back on without them before and everything was pretty messy by the time I got home included my hoods which caused my hands to get greasy the next couple times I rode until I cleaned them). I try to remember to wear them when at home for the greasy stuff but often forget.
__________________
Bikes: 1996 Eddy Merckx Titanium EX, 1989/90 Colnago Super(issimo?) Piu(?), 1990 Concorde Aquila(hit by car while riding), others in build queue "when I get the time"