I confess - I have :(
I haven't for top thread running low, but I sometimes do if I'm nearly finished with a quilt design and I know the bobbin is nearly empty and I'm hoping and praying it will last out. We're daft aren't we!?!
Yes it seems like a silly thing to do...I'm glad I'm not he only one!!!
I checked last night when both bobbin and top thread were running out and NO!! I slow down!! I'm sure it makes the thread last longer!!