A few months ago. Had a bit of decent weather for a change and went out on the MTB for a relatively long ride after just short fast rides and turbo sessions.
Planned a ride along the canals then a stop off at a pub as it was going dark then potter back along the roads.
Back tyre went spongy so slow puncture I thought. Put a tube in, check tyre for thorns nothing so set off again. 10 mins later same scenario, check tyre nothing in it and it’s really getting close to dark now so just decide to pump it up as much as I can and hope for best.
Same again. Another tube more checking of the tyre and nothing in it. By this time I’d given up and started heading home. Same again. Turns out there was a tiny split in the sidewall and I mean really tiny and it was pushing the tube through.
Stuck a tyre boot in and set off on my last tube and patch. Got me home but wasted about an hour and half of messing about.